CLIFFORD, Justice.
Karen Salenius appeals from a judgment entered in the Superior Court (Knox County, Alexander, J.) affirming the order of the District Court (Rockland, Wescott, J.) dismissing her M.R.Civ.P. 60(b) motion for relief from a 1988 divorce judgment. Karen contends that the District Court erred in denying her relief because the 1988 judgment did not divide all of the parties’ marital property, and, in addition, erred in determining that 19 M.R.S.A. § 722-A(6) (Supp.1994), the omitted property statute, could not be applied retroactively. Finding no merit in her contentions, we affirm the judgment.
Richard and Karen Salenius were married in 1980 and divorced in 1988. Pursuant to M.R.Civ.P. 80(n),2 Richard and Karen each filed a list of their marital and nonmarital property. Richard, who had been on active duty with the United States Coast Guard since 1971, did not include his right to a military pension in his property list. Karen did not include Richard’s pension in her list either. Both parties were aware that Richard would be entitled to a pension on his retirement.
The divorce judgment divided the marital property as follows:
Each party will keep the balance of bank accounts presently in his or her name. The 1983 Dodge Aries, his ski[ ]s, his bicycle, his paternal grandfather’s dresser and night stand, the foam Hollywood couch, the stereo, the 16" chainsaw, and the rowing machine will be set aside to [Richard]. All other items of personal property will be set aside to [Karen].
Consistent with the Rule 80(n) statements, the judgment did not specifically mention Richard’s pension.
Over four years later, Karen filed a motion for relief from the divorce judgment pursuant to M.R.Civ.P. 60(b)(6). The motion al[428]*428leged that the judgment did not adjudicate Richard’s pension and requested that the court divide it pursuant to 19 M.R.S.A. § 722-A(6).3 During the hearing, Karen argued in the alternative that the 1988 judgment actually awarded the pension to her pursuant to the above quoted paragraph.
The court found that at the time of the divorce, Karen was aware that Richard “had been accruing pension rights but she did not know that these rights were ‘marital property1 which could be disposed of by the Court.” The court ruled that (1) Karen’s motion was actually a 60(b)(1) motion because it was based on her mistake that the pension was nonmarital property, (2) the motion was not timely because it was not filed within one year of the 1988 judgment as required under Rule 60(b)(1), (3) section 722-A(6) did not apply to judgments entered before its effective date, and (4) the 1988 judgment “does not operate as an award to [Karen] of [Richard’s] military pension rights earned during the parties’ marriage because that judgment fails to make any findings which would support the conclusion that the Court intended to award such rights to [Karen].” The Superior Court affirmed the District Court,4 and this appeal followed.
I.
At the time of the divorce in 1988, Karen, who was represented by counsel, was fully aware of Richard’s unvested pension rights and chose not to assert any interest in that pension. Four years after the divorce became final, however, Karen changed her mind. Without alleging fraud, misrepresentation, or advancing any compelling reason for her failure to claim an interest in Richard’s pension at the time of the divorce, she moved to set aside the divorce judgment to claim a share of the pension pursuant to M.R.Civ.P. 60(b). Although Richard’s pension may have constituted marital property at the time of the divorce, Karen had an obligation to bring that to the court’s attention at that time to allow the court to determine what property was marital. See Fitch v. Fitch, 645 A.2d 631, 632-33 (Me.1994); M.R.Civ.P. 80(e) (parties have an obligation to file financial information with the court).
Rule 60(b) “presupposes that a party has performed [her] duty to take legal steps to protect [her] own interest in the original litigation.” Reville v. Reville, 370 A.2d 249, 254 (Me.1977); it “is not intended as an alternative method of appeal.” Kolmosky v. Kolmosky, 631 A.2d 419, 421 (Me.1993) (citing Reville, 370 A.2d at 254). The court correctly considered Karen’s motion, labelled 60(b)(6), as a rule 60(b)(1) motion based on mistake or inadvertence. Since the motion was not brought within one year from the date of judgment as required by the rule, the court acted within its discretion in denying her relief. Moreover, Karen advanced no justification for her failure to call Richard’s pension to the attention of the court and assert an interest in it. Therefore, she is not entitled to relief pursuant to any of the provisions of Rule 60(b). Reville, 370 A.2d at 253. Unless the 1988 divorce judgment did in fact award Richard’s pension to Karen, or section 722-A(6) applies retroactively to this divorce judgment entered prior to its effective date, the court properly acted within its discretion in denying Rule 60(b) relief to Karen.
II.
Karen contends that the District Court erred in finding that Richard’s pension was unadjudicated. Although the 1988 judgment did not specifically mention the pen[429]*429sion, Karen asserts that it was awarded to her pursuant to the provision that “[a]ll other items of personal property will be set aside to [Karen].” We disagree.
As the District Court concluded, the record is devoid of any evidence that the pension was to be awarded to Karen. It appears that the provision relied on by Karen was intended to include only those items of personal property referenced in the parties’ Rule 80(n) lists. Those lists made no reference to Richard’s pension rights. The court did not err in its interpretation of the 1988 judgment. See Bliss v. Bliss, 583 A.2d 208, 210 (Me.1990) (“a divorce court has the power at any time to clarify an ambiguous judgment it has previously issued”).
III.
Karen further contends that 19 M.R.S.A. § 722-A(6) should be applied to reopen this 1988 judgment. Section 722-A(6) was enacted to take effect on September 30, 1989, and does not contain any explicit provision that it is to apply retroactively. The key to the proper application of a statute is to determine the intent of the legislature from the language of the statute. See, e.g., Estate of Stone, 621 A.2d 852, 853 (Me.1993). Generally, a statute will be construed to apply prospectively unless a legislative intent to make it retroactive is clearly stated. Terry v. St. Regis Paper Co., 459 A.2d 1106, 1109 (Me.1983); Coates v. Maine Employment Sec. Comm’n, 406 A.2d 94, 97 (Me.1979).
A.statute’s history may also be resorted to to help determine legislative intent. State v. Norton, 335 A.2d 607, 613 n. 3 (Me.1975). As initially proposed, the legislation expressly stated that a spouse could reach military pension benefits not specifically disposed of in the divorce judgment regardless of the date of the divorce judgment. See L.D. 426 (114th Legis.1989).5
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CLIFFORD, Justice.
Karen Salenius appeals from a judgment entered in the Superior Court (Knox County, Alexander, J.) affirming the order of the District Court (Rockland, Wescott, J.) dismissing her M.R.Civ.P. 60(b) motion for relief from a 1988 divorce judgment. Karen contends that the District Court erred in denying her relief because the 1988 judgment did not divide all of the parties’ marital property, and, in addition, erred in determining that 19 M.R.S.A. § 722-A(6) (Supp.1994), the omitted property statute, could not be applied retroactively. Finding no merit in her contentions, we affirm the judgment.
Richard and Karen Salenius were married in 1980 and divorced in 1988. Pursuant to M.R.Civ.P. 80(n),2 Richard and Karen each filed a list of their marital and nonmarital property. Richard, who had been on active duty with the United States Coast Guard since 1971, did not include his right to a military pension in his property list. Karen did not include Richard’s pension in her list either. Both parties were aware that Richard would be entitled to a pension on his retirement.
The divorce judgment divided the marital property as follows:
Each party will keep the balance of bank accounts presently in his or her name. The 1983 Dodge Aries, his ski[ ]s, his bicycle, his paternal grandfather’s dresser and night stand, the foam Hollywood couch, the stereo, the 16" chainsaw, and the rowing machine will be set aside to [Richard]. All other items of personal property will be set aside to [Karen].
Consistent with the Rule 80(n) statements, the judgment did not specifically mention Richard’s pension.
Over four years later, Karen filed a motion for relief from the divorce judgment pursuant to M.R.Civ.P. 60(b)(6). The motion al[428]*428leged that the judgment did not adjudicate Richard’s pension and requested that the court divide it pursuant to 19 M.R.S.A. § 722-A(6).3 During the hearing, Karen argued in the alternative that the 1988 judgment actually awarded the pension to her pursuant to the above quoted paragraph.
The court found that at the time of the divorce, Karen was aware that Richard “had been accruing pension rights but she did not know that these rights were ‘marital property1 which could be disposed of by the Court.” The court ruled that (1) Karen’s motion was actually a 60(b)(1) motion because it was based on her mistake that the pension was nonmarital property, (2) the motion was not timely because it was not filed within one year of the 1988 judgment as required under Rule 60(b)(1), (3) section 722-A(6) did not apply to judgments entered before its effective date, and (4) the 1988 judgment “does not operate as an award to [Karen] of [Richard’s] military pension rights earned during the parties’ marriage because that judgment fails to make any findings which would support the conclusion that the Court intended to award such rights to [Karen].” The Superior Court affirmed the District Court,4 and this appeal followed.
I.
At the time of the divorce in 1988, Karen, who was represented by counsel, was fully aware of Richard’s unvested pension rights and chose not to assert any interest in that pension. Four years after the divorce became final, however, Karen changed her mind. Without alleging fraud, misrepresentation, or advancing any compelling reason for her failure to claim an interest in Richard’s pension at the time of the divorce, she moved to set aside the divorce judgment to claim a share of the pension pursuant to M.R.Civ.P. 60(b). Although Richard’s pension may have constituted marital property at the time of the divorce, Karen had an obligation to bring that to the court’s attention at that time to allow the court to determine what property was marital. See Fitch v. Fitch, 645 A.2d 631, 632-33 (Me.1994); M.R.Civ.P. 80(e) (parties have an obligation to file financial information with the court).
Rule 60(b) “presupposes that a party has performed [her] duty to take legal steps to protect [her] own interest in the original litigation.” Reville v. Reville, 370 A.2d 249, 254 (Me.1977); it “is not intended as an alternative method of appeal.” Kolmosky v. Kolmosky, 631 A.2d 419, 421 (Me.1993) (citing Reville, 370 A.2d at 254). The court correctly considered Karen’s motion, labelled 60(b)(6), as a rule 60(b)(1) motion based on mistake or inadvertence. Since the motion was not brought within one year from the date of judgment as required by the rule, the court acted within its discretion in denying her relief. Moreover, Karen advanced no justification for her failure to call Richard’s pension to the attention of the court and assert an interest in it. Therefore, she is not entitled to relief pursuant to any of the provisions of Rule 60(b). Reville, 370 A.2d at 253. Unless the 1988 divorce judgment did in fact award Richard’s pension to Karen, or section 722-A(6) applies retroactively to this divorce judgment entered prior to its effective date, the court properly acted within its discretion in denying Rule 60(b) relief to Karen.
II.
Karen contends that the District Court erred in finding that Richard’s pension was unadjudicated. Although the 1988 judgment did not specifically mention the pen[429]*429sion, Karen asserts that it was awarded to her pursuant to the provision that “[a]ll other items of personal property will be set aside to [Karen].” We disagree.
As the District Court concluded, the record is devoid of any evidence that the pension was to be awarded to Karen. It appears that the provision relied on by Karen was intended to include only those items of personal property referenced in the parties’ Rule 80(n) lists. Those lists made no reference to Richard’s pension rights. The court did not err in its interpretation of the 1988 judgment. See Bliss v. Bliss, 583 A.2d 208, 210 (Me.1990) (“a divorce court has the power at any time to clarify an ambiguous judgment it has previously issued”).
III.
Karen further contends that 19 M.R.S.A. § 722-A(6) should be applied to reopen this 1988 judgment. Section 722-A(6) was enacted to take effect on September 30, 1989, and does not contain any explicit provision that it is to apply retroactively. The key to the proper application of a statute is to determine the intent of the legislature from the language of the statute. See, e.g., Estate of Stone, 621 A.2d 852, 853 (Me.1993). Generally, a statute will be construed to apply prospectively unless a legislative intent to make it retroactive is clearly stated. Terry v. St. Regis Paper Co., 459 A.2d 1106, 1109 (Me.1983); Coates v. Maine Employment Sec. Comm’n, 406 A.2d 94, 97 (Me.1979).
A.statute’s history may also be resorted to to help determine legislative intent. State v. Norton, 335 A.2d 607, 613 n. 3 (Me.1975). As initially proposed, the legislation expressly stated that a spouse could reach military pension benefits not specifically disposed of in the divorce judgment regardless of the date of the divorce judgment. See L.D. 426 (114th Legis.1989).5 In subsequent amendments, however, the bill was broadened to apply to all marital property, but significantly, its sweeping language providing for retroactive application was deleted. P.L. 1989, ch. 150.
Moreover, the change in Maine law brought about by this statute compels a conclusion that it was intended to be prospective only. Maine is an equitable distribution state, and not a community property state. One of the principal differences between the two is the nature of the spouse’s interest in property to which the other spouse holds legal title. In a community property state, the spouse acquires a “1present vested undivided one-half interest in all property acquired during the existence of the marital relationship’ ” regardless of the state of title. Hursey v. Hursey, 284 S.C. 323, 326 S.E.2d 178, 181 (Ct.App.1985) (quoting Rogers v. Rogers, 98 A.D.2d 386, 470 N.Y.S.2d 401, 404-05 (1983)) (emphasis in original). By contrast, in an equitable distribution state such as Maine, each spouse retains sole interest in property held in his or her name, subject to the right of the other spouse to equitable distribution. Thus, legal title to property remains unaffected by a divorce judgment that failed to set it apart. See Weber v. Allen, 574 A.2d 1362, 1364 (Me.1990) (holding that title to real estate held jointly by divorced couple remained unaffected by the 1961 divorce judgment that failed to divide it).6
Section 722-A(6), however, changed that law to provide that all property omitted from the divorce judgment, regardless of which spouse holds legal title to the property, is deemed held by the parties as tenants in common. Not only does section 722-A(6) change Maine’s equitable distribution scheme, it represents a limited exception to the doctrine of res judicata, which bars the relitigation of all issues that were tried or could have been tried in the prior litigation. See Sargent v. Sargent, 622 A.2d 721, 722 n. 1 (Me.1993). Res judicata serves the critical [430]*430policies of judicial economy, the stability of final judgments, and fairness to litigants. See Connecticut Nat’l Bank v. Kendall, 617 A.2d 544, 546 (Me.1992); Currier v. Cyr, 570 A.2d 1205, 1208 (Me.1990).
We have long recognized the particular importance of stability and finality of property settlements. As we observed in Merrill v. Merrill, 449 A.2d 1120 (Me.1982), “it is necessary that judgments, especially those settling property rights as in this case, have a high degree of stability and finality.” Id. at 1124; see Kolmosky, 631 A.2d at 421 (it is in the public interest that final divorce judgments not be easily altered); see also Reville, 370 A.2d at 253. Because the parties’ interest in the finality of property divisions is so important, we are in accord with the many other equitable distribution jurisdictions that bar subsequent litigation over property rights that could have been raised in the original divorce proceedings.7 Section 722-A(6) disturbs this settled policy as well.
The absence of clear language in the statute giving it retroactive application indicates that the legislature did not intend such a dramatic departure from the prior law to apply to divorce judgments, like the one in this case, that became final long before the statute’s enactment.
Judgment affirmed.
WATHEN, C.J., and ROBERTS and RUDMAN, JJ., concur.