JERRY E. SMITH, Circuit Judge:
The 512 plaintiffs of a joint, state-law tort action (the “Allen plaintiffs” or “plaintiffs”) appeal the removal of their claims to federal court. They contend that the district court erred in finding federal subject-matter jurisdiction under 28 U.S.C. § 1332 (diversity of citizenship), because it improperly “aggregated” their claim for punitive damages as a “whole” in reaching the $50,000.01 amount-in-controversy mark for each plaintiff. They also claim the district court misapplied the standard for assessing the amount in controversy when plaintiffs challenge defendants’ assertion of removal jurisdiction. Because we find that each plaintiff has an undivided claim for the full amount of the alleged punitive damages, which on the face of the complaint more likely than not exceeds the jurisdictional amount, we affirm.
I.
On May 20, 1990, an oil and gas well exploded near the town of Heidelberg, Mississippi, causing evacuation of the area. According to the plaintiffs, who are local residents, they suffered property damage and wide-ranging, physical and mental injuries from the explosion and release of toxic fumes.
Subsequently, the 512 Allen plaintiffs jointly filed suit in Mississippi state court against R & H Oil & Gas Company, Farrar Oilfield Service and Equipment Company, and TriState Oil Services, Inc. (collectively, the “defendants”), which operated the well. The Allen plaintiffs’ individual claims — the suit is not a class action — are based upon theories of negligence and strict liability, and they seek compensatory and punitive damages. No specific amount of damages was pled.
The defendants, which are Louisiana corporations, petitioned for removal to federal court, asserting that there was complete diversity of citizenship between the set of plaintiffs and the set of defendants. See 28 U.S.C. §§ 1441, 1446. They also contended, in conclusory terms, that the $50,000.01 amount-in-controversy requirement was met. Removal was granted.
The plaintiffs, in the discovery phase of the case before a magistrate judge, then moved to remand on the ground that the amount-in-controversy requirement was not met. The gravamen of their motion was that the defendants had failed to present any evidence that showed that each plaintiff’s claim exceeded § 1332’s $50,000 requirement.
The defendants, in response, made two arguments. First, they contended that the alleged punitive damage award could be assessed against each individual plaintiff. In the alternative, they argued that an exception to the amount-in-controversy’s non-aggregation principle applied, so that each individual plaintiffs potential punitive damage award could be aggregated and applied to the $50,000 requirement.
After considering the parties’ memoranda, the magistrate judge, in a “bare bones” order, recommended denying remand. In upholding the order, the district court reasoned that the aggregation of the potential punitive damages award was proper, as each plaintiff shared in a common and undivided interest in the claim.1
The court also considered the plaintiffs’ motion to “clarify” their complaint by amendment to seek explicitly less than the requisite amount in compensatory and punitive dam[1330]*1330ages. This motion likewise was denied on the ground that such post-petition amendments were mooted by the finding that the punitive damages alone met the requisite amount. Finally, the district court, recognizing the split among district courts in this circuit on the issue of aggregation of punitive damages, certified this case for immediate appeal via 28 U.S.C. § 1292(b).
II.
Removal is controlled by 28 U.S.C. § 1441, which provides, in relevant part, that “any civil action brought in a State court of which the district courts of the United States have original jurisdiction, may be removed by the defendant or the defendants, to the district court of the United States.... ” Such original jurisdiction exists, for example, if there is “diversity of citizenship,” such as where the suit is between citizens of different states and the amount-in-controversy exceeds $50,000. 28 U.S.C. § 1332. Here, plaintiffs do not dispute diversity but question the application of the amount-in-controversy standard.2
A.
The Supreme Court has long interpreted § 1332’s phrase “matter in controversy” not to allow multiple plaintiffs to add together “separate and distinct demands, unite[d] for convenience and economy in a single suit,” to meet the requisite jurisdictional level. See Snyder v. Harris, 394 U.S. 332, 336, 89 S.Ct. 1053, 1057, 22 L.Ed.2d 319 (1969) (quoting Troy Bank v. G.A. Whitehead & Co., 222 U.S. 39, 40, 32 S.Ct. 9, 9, 56 L.Ed 81 (1911)); Zahn v. International Paper Co., 414 U.S. 291, 301, 94 S.Ct. 505, 512, 38 L.Ed.2d 511 (1973) (“[O]ne plaintiff may not ride in on another’s coattails.”) (citation omitted).3 The general rule is that each plaintiff who invokes diversity of citizenship jurisdiction must allege damages that meet the dollar requirement of § 1332.
“Aggregation” of damages allegedly owed to separate plaintiffs, however, may be permitted in the limited situation where “two or more plaintiffs unite to enforce a single title or right in which they have a common and undivided interest.” Snyder, 394 U.S. at 335, 89 S.Ct. at 1056.4 Unfortunately, the “common and undivided” test retains an amorphous quality. In applying this standard, many courts have failed to eschew labels. And stating the maxim is far easier than determining the principles that under-gird it. The standards that have developed in this area largely have their origins in pre-Federal Rules easelaw and take their modem day form by only judicial application. Accordingly, we address the recognized guidelines that so far have evolved before applying them to the punitive damages claim here.
[1331]*1331Courts generally agree that the plaintiffs’ claims of right must be “integrated,” meaning that their respective rights to damages arise from the same legal source. See Texas & Pac. Ry. v. Gentry, 163 U.S. 353, 362-63, 16 S.Ct. 1104, 1107, 41 L.Ed. 186 (1896) (holding aggregation proper where plaintiffs “all claimed under one and the same title”).5 The application of this standard depends upon the history-laden notion of what constitutes an individual cause of action.6 Therefore, a necessary first step is an examination of the configuration of the state-law right at issue.
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JERRY E. SMITH, Circuit Judge:
The 512 plaintiffs of a joint, state-law tort action (the “Allen plaintiffs” or “plaintiffs”) appeal the removal of their claims to federal court. They contend that the district court erred in finding federal subject-matter jurisdiction under 28 U.S.C. § 1332 (diversity of citizenship), because it improperly “aggregated” their claim for punitive damages as a “whole” in reaching the $50,000.01 amount-in-controversy mark for each plaintiff. They also claim the district court misapplied the standard for assessing the amount in controversy when plaintiffs challenge defendants’ assertion of removal jurisdiction. Because we find that each plaintiff has an undivided claim for the full amount of the alleged punitive damages, which on the face of the complaint more likely than not exceeds the jurisdictional amount, we affirm.
I.
On May 20, 1990, an oil and gas well exploded near the town of Heidelberg, Mississippi, causing evacuation of the area. According to the plaintiffs, who are local residents, they suffered property damage and wide-ranging, physical and mental injuries from the explosion and release of toxic fumes.
Subsequently, the 512 Allen plaintiffs jointly filed suit in Mississippi state court against R & H Oil & Gas Company, Farrar Oilfield Service and Equipment Company, and TriState Oil Services, Inc. (collectively, the “defendants”), which operated the well. The Allen plaintiffs’ individual claims — the suit is not a class action — are based upon theories of negligence and strict liability, and they seek compensatory and punitive damages. No specific amount of damages was pled.
The defendants, which are Louisiana corporations, petitioned for removal to federal court, asserting that there was complete diversity of citizenship between the set of plaintiffs and the set of defendants. See 28 U.S.C. §§ 1441, 1446. They also contended, in conclusory terms, that the $50,000.01 amount-in-controversy requirement was met. Removal was granted.
The plaintiffs, in the discovery phase of the case before a magistrate judge, then moved to remand on the ground that the amount-in-controversy requirement was not met. The gravamen of their motion was that the defendants had failed to present any evidence that showed that each plaintiff’s claim exceeded § 1332’s $50,000 requirement.
The defendants, in response, made two arguments. First, they contended that the alleged punitive damage award could be assessed against each individual plaintiff. In the alternative, they argued that an exception to the amount-in-controversy’s non-aggregation principle applied, so that each individual plaintiffs potential punitive damage award could be aggregated and applied to the $50,000 requirement.
After considering the parties’ memoranda, the magistrate judge, in a “bare bones” order, recommended denying remand. In upholding the order, the district court reasoned that the aggregation of the potential punitive damages award was proper, as each plaintiff shared in a common and undivided interest in the claim.1
The court also considered the plaintiffs’ motion to “clarify” their complaint by amendment to seek explicitly less than the requisite amount in compensatory and punitive dam[1330]*1330ages. This motion likewise was denied on the ground that such post-petition amendments were mooted by the finding that the punitive damages alone met the requisite amount. Finally, the district court, recognizing the split among district courts in this circuit on the issue of aggregation of punitive damages, certified this case for immediate appeal via 28 U.S.C. § 1292(b).
II.
Removal is controlled by 28 U.S.C. § 1441, which provides, in relevant part, that “any civil action brought in a State court of which the district courts of the United States have original jurisdiction, may be removed by the defendant or the defendants, to the district court of the United States.... ” Such original jurisdiction exists, for example, if there is “diversity of citizenship,” such as where the suit is between citizens of different states and the amount-in-controversy exceeds $50,000. 28 U.S.C. § 1332. Here, plaintiffs do not dispute diversity but question the application of the amount-in-controversy standard.2
A.
The Supreme Court has long interpreted § 1332’s phrase “matter in controversy” not to allow multiple plaintiffs to add together “separate and distinct demands, unite[d] for convenience and economy in a single suit,” to meet the requisite jurisdictional level. See Snyder v. Harris, 394 U.S. 332, 336, 89 S.Ct. 1053, 1057, 22 L.Ed.2d 319 (1969) (quoting Troy Bank v. G.A. Whitehead & Co., 222 U.S. 39, 40, 32 S.Ct. 9, 9, 56 L.Ed 81 (1911)); Zahn v. International Paper Co., 414 U.S. 291, 301, 94 S.Ct. 505, 512, 38 L.Ed.2d 511 (1973) (“[O]ne plaintiff may not ride in on another’s coattails.”) (citation omitted).3 The general rule is that each plaintiff who invokes diversity of citizenship jurisdiction must allege damages that meet the dollar requirement of § 1332.
“Aggregation” of damages allegedly owed to separate plaintiffs, however, may be permitted in the limited situation where “two or more plaintiffs unite to enforce a single title or right in which they have a common and undivided interest.” Snyder, 394 U.S. at 335, 89 S.Ct. at 1056.4 Unfortunately, the “common and undivided” test retains an amorphous quality. In applying this standard, many courts have failed to eschew labels. And stating the maxim is far easier than determining the principles that under-gird it. The standards that have developed in this area largely have their origins in pre-Federal Rules easelaw and take their modem day form by only judicial application. Accordingly, we address the recognized guidelines that so far have evolved before applying them to the punitive damages claim here.
[1331]*1331Courts generally agree that the plaintiffs’ claims of right must be “integrated,” meaning that their respective rights to damages arise from the same legal source. See Texas & Pac. Ry. v. Gentry, 163 U.S. 353, 362-63, 16 S.Ct. 1104, 1107, 41 L.Ed. 186 (1896) (holding aggregation proper where plaintiffs “all claimed under one and the same title”).5 The application of this standard depends upon the history-laden notion of what constitutes an individual cause of action.6 Therefore, a necessary first step is an examination of the configuration of the state-law right at issue. See, e.g., Asociación Nacional de Pescadores a Pequeña Escala o Artesanales de Colombia (ANPAC) v. Dow Quimica de Colombia S.A., 988 F.2d 559, 563-64 (5th Cir.1993) (examining Texas state law to determine whether fishermen had common property right in fishing stock harmed by oil spill), cert. denied, — U.S. —, 114 S.Ct. 685, 126 L.Ed.2d 653 (1994) (hereinafter “ANPAC ”). Again, the purpose of this inquiry is to determine whether the state law claim creates one right of recovery. Id. at 564.
Another factor that courts long have used to determine whether a claim is common or separate is the apportionment of the award. A claim is more likely to be integrated if the defendant has no interest in the apportionment of an award among the plaintiffs.7
Plaintiffs, of course, may have strong interests in the eventual distribution of awards, but the ultimate separability of a claim does not defeat its integrated quality. “Occasionally, plaintiffs seek to enforce a common interest that is separable amongst themselves. In such cases, the common nature of the plaintiffs’ interest vis-a-vis the defendant dictates that aggregation is proper.” 1 MooRE, supra, ¶ 0.97[3], at 921.8
B.
Keeping these standards in mind, we must decide whether joint claims for punitive damages under Mississippi law present a united claim for a common and undivided interest. This question is an issue of first impression [1332]*1332on the appellate level in this circuit.9 We begin by examining the nature of punitive damages.
Punitive damages punish. The almost unanimous rule is that “[p]unitive damages by definition are not intended to compensate the injured party, but rather to punish the tortfeasor whose wrongful action was intentional or malicious, and to deter him and others from similar extreme conduct.” City of Newport v. Fact Concerts, Inc., 453 U.S. 247, 266-267, 101 S.Ct. 2748, 2759, 69 L.Ed.2d 616 (1981).10
Mississippi’s controlling law on punitive damages follows the majority rule. According to the Mississippi Supreme Court, a rea[1333]*1333sonable instruction on the state’s law of punitive damages is as'follows:
Punitive damages are added damages awarded for public service in bringing a wrongdoer to account, as an example to warn and deter others from repeating the same act. They are never awarded to benefit the injured party or as a matter of right, but rather to punish and to compel the wrongdoer to have due and proper regard for the rights of the public.
McGowan v. Estate of Wright, 524 So.2d 308, 310 (Miss.1988); see also Wesson v. United States, 48 F.3d 894, 899-900 (5th Cir.1995) (examining nature of punitive damages under Mississippi law). Mississippi’s legislature recently codified this view of the law, fully effective as of July 1, 1994. See Miss.Code Ann. § 11-1-65 (Supp.1994).
Punitive damages in Mississippi therefore are fundamentally collective; their purpose is to protect society by punishing and deterring wrongdoing. Id.; see 1 Sohlueter & Redden, supra, §§ 2.0 to 2.2 (examining purposes and policies behind punitive damages). Their focus is not any one individual plaintiff; instead, the award is tailored to the defendant’s wealth and wrongdoing. See Andrew Jackson Life Ins. Co. v. Williams, 566 So.2d 1172, 1190 (Miss.1990) (examining factors that juries may consider in determining quantum of punitive damages award); see also Miss.Code Ann. § 11-1-65(l)(e) (listing factors for jury to consider). The benefits of the award are meant to accrue to society.
Because punitive damages in Mississippi are not compensatory, they are individual awards in function only. While separate plaintiffs may seek an award in separate cases,11 the narrow right to seek such damages exists only because public policy as expressed through state statutes and the common law so dictate. See generally 22 Am.Jur.2d Damages § 734, at 787 (1988) (“So viewed, punitive damages are allowed on grounds of public policy and in the interest of society and for the public benefit.”) (footnotes omitted). An individual’s damages or harm is relevant only to assessing the defendant’s wrongdoing.12
Finally, the general rule is that a plaintiff does not have a claim of right to punitive damages, and “it is always within the discretion of the jury or trial judge to withhold them.” W. Page Keeton et al., Prosser and Keeton on the law of Torts § 2, at 14 (5th ed. 1984); see Wirtz v. Switzer, 586 So.2d 775, 783 (Miss.1991) (“The award of punitive damages, along with the amount of such, are [sic] within the discretion of the trier of fact.”). In other words, a claim for punitive damages is not by itself an independent tort. Hence, it is only because of the unique nature of these exemplary awards that they exhibit some of the characteristics of a separate claim of right.
C.
Accordingly, while punitive damages do not fall neatly into either the “non-aggregation” caselaw or the “common and undivided interest” exception, the unique nature of these awards requires, at least in Mississippi, that the full amount of alleged damages be counted against each plaintiff in determining the jurisdictional amount. As punitive dam[1334]*1334ages are collective awards, each plaintiff has an integrated right to the full amount of an award. An award’s ultimate distribution does not change this result.
Punitive damages are, to use the language of the caselaw, undivided claims of right with a potentially separable award. Here, each of the 512 plaintiffs was empowered to bring a claim for punitive damages separately. The fact that they choose not to pursue their claims individually does not limit each plaintiff’s alleged entitlement to the award; it only affects its distribution. The limiting factor here was the plaintiffs’ decision to file jointly.
Of course, a defendant’s interest in seeing individual plaintiffs’ cases fail is greatly affected by the procedural posture of such claims.- In class actions or multi-plaintiff suits, the defendant’s potential exposure to a large punitive damage award is not affected by the failure of individual claims as long as one plaintiff is successful. Accordingly, in that situation, the defendant has no interest in the distribution of the award, a fact that has long supported the conclusion that the plaintiffs claims of right are common and undivided. See, e.g., Berman, 414 F.2d at 316.
Where a defendant faces a series of individual claims, it is affected strongly by the success or failure of each individual claim for punitive damages, because the general rule is that previous awards are not a limiting factor on subsequent awards. We thus recognize that while plaintiffs generally share an undivided interest in being awarded punitive damages, that interest is not common in the sense that there is one and only one award that they would split equally.
Nonetheless, we do not find that the potential for multiple liability makes the plaintiffs’ claims separate. The seeming anomaly of multiple exposures for punitive damages arising out of the same conduct is justified because of its extreme potential to punish and deter. See Maxey v. Freightliner Corp., 450 F.Supp. 955, 962 (N.D.Tex.1978) (Higginbotham, J.) (examining Texas state law), aff'd, 623 F.2d 395 (5th Cir.1980), reh’g on other grounds, 665 F.2d 1367 (5th Cir.1982) (en banc).13 Such a harsh, and to some absurd, result is “tolerated as a price of private achievement of a public goal,” not because it provides a windfall to individual plaintiffs. Id. The award is not the plaintiffs’ but society’s.
Finally, under the accepted view of punitive damages as a public good, no aggregation — meaning the addition of separate claims — is necessary, as each plaintiffs share of an award is not added up to exceed $50,-000 — -just as one award does not subtract from a future claimant’s entitlement. In[1335]*1335stead, the claims, while jointly tried, are treated as belonging to each plaintiff for jurisdictional purposes. In sum, because of the collective scope of punitive damages and their nature as individual claims under Mississippi law, we hold that under Mississippi law the amount of such an alleged award is counted against each plaintiffs required jurisdictional amount.
III.
The plaintiffs also raise the issue of the proper burden of proof for measuring a defendant’s assertion of the jurisdictional amount. While this issue has not been without some controversy in this circuit, recent caselaw has settled much of it.
While it is well settled that the removing party bears the burden of establishing the facts necessary to show that federal jurisdiction exists, Gaitor v. Peninsular & Occidental S.S. Co., 287 F.2d 252, 253-54 (5th Cir.1961), we have applied different standards of proof depending upon whether the complaint alleges a dollar amount of damages. Where the plaintiff has alleged a sum certain that exceeds the requisite amount in controversy, that amount controls if made in good faith. St. Paul Mercury Indem. Co. v. Red Cab Co., 303 U.S. 283, 289, 58 S.Ct. 586, 590, 82 L.Ed. 845 (1938). In order for a court to refuse jurisdiction “it [must] appear to a legal certainty that the claim is really for less than the jurisdictional amount.” Of course, if a plaintiff pleads damages less than the jurisdiction amount, he generally can bar a defendant from removal.14 Thus, in the typical diversity case, the plaintiff remains the master of his complaint.
The converse situation to St. Paul Mercury is where a plaintiff fails to specify the amount in controversy. This situation — not unusual in this circuit, as both Texas and Louisiana state civil procedure disallows damage claims for specific amounts, see Tex. R.CxvP. 47; La.Code Civ.PROC. Art. 893— does not impose the same “legal certainty” test. Instead, “[w]hen the plaintiffs complaint does not allege a specific amount of damages, the removing defendant must prove by a preponderance of the evidence that the amount in controversy exceeds $50,-000.” De Aguilar v. Boeing Co., 11 F.3d 55, 58 (5th Cir.1993) (hereinafter “De Aguilar I”).
We have never listed explicitly what types of proof are acceptable under this standard. Some caselaw, however, guides the district court’s analysis. First, a court can determine that removal was proper if it is facially apparent that the claims are likely above $50,000. See De Aguilar I, 11 F.3d at 57; cf. ANPAC, 988 F.2d at 566 (holding, in part, that remand was proper where the amount was not otherwise “facially apparent”). If not, a removing attorney may support federal jurisdiction by setting forth the facts in controversy — preferably in the removal petition, but sometimes by affidavit— that support a finding of the requisite amount. See Garza v. Bettcher Indus. Inc., 752 F.Supp. 753, 763 (E.D.Mich.1990).
Removal, however, cannot be based simply upon conclusory allegations. Gaus v. Miles, Inc., 980 F.2d 564, 567 (9th Cir.1992). Finally, under any manner of proof, the jurisdictional facts that support removal must be judged at the time of the removal, and any post-petition affidavits are allowable only if relevant to that period of time. ANPAC, 988 F.2d at 565.
Here, plaintiffs dispute whether the district court applied the proper burden of proof necessary to determine the “jurisdictional [1336]*1336facts” for removal. This argument is made in two parts. First, the plaintiffs spill much ink dissecting easelaw in order to argue that this circuit does not have an established standard. This argument is meritless, as De Aguilar I established that a party seeking removal of a claim that does not allege a specific amount need only prove the jurisdictional facts by a preponderance of the evidence.
In the alternative, the plaintiffs argue that the district court erred in applying De Aguilar I by requiring less than “preponderance” proof. To support this argument, the plaintiffs read the district court’s order denying their motion for remand to apply implicitly a “possibility of liability” standard. They also cite language from the defendants’ opposition to the remand that they believe is conclusion-ary.
The district court did not state explicitly what standard it was applying, but only stated that “the magistrate judge’s implicit conclusion that aggregated punitive damages could well exceed $50,000 can certainly not be characterized as ‘clearly erroneous’ or ‘contrary to law.’ ” (emphasis added). A “could well” standard sounds more like a “possibility” standard of proof, rather than a “more likely or not” standard. As such, the district court’s conclusion and, hence, its order are based upon an erroneous view of the law.
We need not remand the ease, however. The application of our proper standard of review — an issue that we have never directly addressed — allows us to affirm. The procedural posture of this case is similar to a Fed.R.Civ.P. 12(b)(6) motion or summary judgment motion. We apply a like standard of review: de novo, applying the same standard of review as should the district court.15 In this case, where the district court is making the “facially apparent” determination, the proper procedure is to look only at the face of the complaint and ask whether the amount in controversy was likely to exceed $50,000. In situations where the facially apparent test is not met, the district court can then require parties to submit summary-judgment-type evidence, relevant to the amount in controversy at the time of removal.16 We would review that determination in a fashion similar to our Fed.R.Civ.P. 56 review.
In this case, the total claim for punitive damages is more likely than not to be for $50,000 or more, as it involves three companies, 512 plaintiffs, and a wide variety of harm allegedly caused by wanton and reckless conduct. A court, in applying only common sense, would find that if the plaintiffs were successful in their punitive damages claim, they would collect more than $50,000. Accordingly, we hold that the face of the complaint supports the assertion of federal jurisdiction.
The plaintiffs also sought to amend their complaint in order to “clarify” the amount in controversy. This argument lacks merit in light of De Aguilar I, 11 F.3d at 57 (holding that amount in controversy may be determined from face of the complaint), and St. Paul Mercury, 303 U.S. at 292, 58 S.Ct. at 592 (holding that post-removal events cannot deprive a court of jurisdiction once it has attached). Once the district court found that it had jurisdiction, the jurisdiction is deemed to have vested in the court at the time of removal. An amendment to the complaint limiting damages for jurisdictional purposes cannot divest jurisdiction.
[1337]*1337IV.
In conclusion, we hold that in Mississippi, a joint claim for punitive damages by multiple plaintiffs should be assessed against each plaintiff as a whole in determining the jurisdictional amount. Here, a claim for punitive damages against three oil companies for wanton and reckless conduct that caused an oil well explosion, the evacuation of a town, and harm to 512 people is, on its face, more likely than not for more than $50,000. And, no post-petition amendment of the complaint can divest the district court of jurisdiction. We therefore AFFIRM.