Opinion by
Mr. Justice Pomeroy,
The Pennsylvania Divorce Law requires that at least one of the parties to a marriage shall have been a “bona fide resident” of the Commonwealth for a period of one year before either party may bring an action for divorce.1 This appeal raises the question whether such a residency requirement is valid under the Constitution of the United States.2
Marian Stottlemyer, the appellant, and her husband, Eugene Stottlemyer, the appellee, were domiciled in Pennsylvania until they moved to Illinois in September, 1970. In August, 1971, after the onset of marital difficulties, the Stottlemyers returned to Pennsylvania and took up separate residences there. On November 16, 1971, the appellant filed a complaint in [506]*506divorce against the appellee in the Court of Common Pleas of York County. From the averments of the complaint it is apparent that neither Marian Stottlemyer, the plaintiff, nor her husband had resided in Pennsylvania for one full year immediately prior to the commencement of the action.
Appellee filed preliminary objections asserting that because the residency requirement of the Act of 1929, supra n.l, had not been met, the court lacked jurisdiction over the cause of action. The trial court sustained the objections and dismissed the action. The Superior Court affirmed, per curiam.3 We granted allocatur because of the important constitutional questions presented.4
Appellant makes essentially two arguments in support of her position that the residency requirement is invalid. The first is that the statutory classification, by distinguishing between those domiciliaries who have [507]*507lived in tlie state for one year and those who have not, violates her right to the equal protection of the laws in that it impedes her right of interstate travel and is not necessary to promote any compelling state interest. Appellant’s second argument is that the statute infringes her right to due process of law by denying her access to the courts for the purpose of obtaining a divorce. We are unable to agree, and will therefore affirm.5
I.
Appellant’s first challenge to the constitutionality of the residency requirement is based upon her right to the equal protection of the laws. At the outset, it is important to bear in mind that the equal protection clause has never stood for the absolute proposition that states may not classify individuals for different treatment. Traditionally, state statutory classifications have been upheld if they “bear some rational relationship to a legitimate state end. . . .” McDonald v. Board of Election, 394 U.S. 802, 809, 22 L.Ed.2d 739, 745 (1969). See also San Antonio Independent School District v. Rodriguez, 411 U.S. 1, 55, 36 L.Ed.2d 16, 56 (1973); McGinnis v. Royster, 410 U.S. 263, 270, 35 L.Ed.2d 282, 288-89 (1973). In recent years, however, classifications which either are based upon certain suspect criteria or are violative of certain fundamental rights have been subjected to a stricter standard of review; such classifications have been upheld only if found necessary to promote a compelling state interest.6 [508]*508Thus, the threshold inquiry in the determination of this case, as in any case in which a denial of equal protection is charged, is which standard of review is to be applied.
It is appellant’s position that the residency requirement in divorce actions must be subjected to the strict scrutiny of the “compelling state interest” test because it penalizes the exercise of her constitutional right of interstate travel. Although not guaranteed by any express provision in the Constitution, the right to move freely from state to state has long been recognized as a basic right of every American. United States v. Guest, 383 U.S. 745, 757-58, 16 L.Ed.2d 239, 249-50 (1966). “[T]he nature of our Federal Union and our constitutional concepts of personal liberty unite to require that all citizens be free to travel throughout the length and breadth of our land uninhibited by statutes, rules, and regulations which unreasonably burden or restrict this movement”. Shapiro v. Thompson, 394 U.S. 618, 629, 22 L.Ed.2d 600, 612 (1969). Finding that some residency requirements impinge upon this freedom of movement within the United States, the Supreme Court has struck down as violative of the equal protection clause state statutes imposing one-year residency requirements [509]*509as conditions to the receipt of welfare benefits, Shapiro v. Thompson, supra, to the exercise of the right to vote, Dunn v. Blumstein, 405 U.S. 330, 31 L.Ed.2d 274 (1972), and to eligibility for non-emergency hospitalization and medical care, Memorial Hospital v. Maricopa County, 415 U.S. 250, 39 L.Ed.2d 306 (1974). In each of these cases, the Court has indicated that any statutory classification which “penalizes” the exercise of the right of interstate travel must be supported by a compelling state interest. Shapiro v. Thompson, supra at 634, 22 L.Ed.2d at 615; Dunn v. Blumstein, supra at 339, 31 L.Ed.2d at 282; Memorial Hospital v. Maricopa County, supra at 258, 39 L.Ed.2d at 315.
While it has thus been protective of the right to travel, the Court has, however, made it clear that residency requirements are not per se invalid. Memorial Hospital v. Maricopa County, supra at 256, 39 L.Ed. 2d at 314. Indeed, many such requirements may not even constitute “penalties” upon interstate travel and therefore may not bring into play the strict scrutiny of the “compelling state interest” test.7 For example, in Vlandis v. Kline, 412 U.S. 441, 37 L.Ed.2d 63 (1973), while it invalidated a Connecticut statute providing for certain irrebuttable presumptions relating to student residency,8 the Court indicated that reasonable [510]*510residency requirements as conditions of eligibility for in-state tuition rates could be imposed due to the “special problems involved in determining the bona fide residence of college students who come from out of State to attend that State’s public university”. Id. at 452, 37 L.Ed.2d at 72. As illustrative, the Court cited its earlier summary affirmance of a federal district court decision upholding the constitutionality of a University of Minnesota regulation requiring that students be bona fide residents of Minnesota for one year as a condition to eligibility for in-state tuition rates. See Starns v. Malkerson, 326 F. Supp. 234 (D. Minn. 1970), affirmed, 401 U.S. 985, 28 L.Ed.2d 527 (1971).9 Similarly, in Hadnott v. Amos, 401 U.S. 968, 28 L.Ed.2d 318 (1971), the Supreme Court affirmed a district court decision which, although invalidating Alabama’s voter residency requirement, upheld a residency requirement for circuit judge candidates. See Hadnott v. Amos, 320 P. Supp. 107 (M.D. Ala. 1970).
[511]
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Opinion by
Mr. Justice Pomeroy,
The Pennsylvania Divorce Law requires that at least one of the parties to a marriage shall have been a “bona fide resident” of the Commonwealth for a period of one year before either party may bring an action for divorce.1 This appeal raises the question whether such a residency requirement is valid under the Constitution of the United States.2
Marian Stottlemyer, the appellant, and her husband, Eugene Stottlemyer, the appellee, were domiciled in Pennsylvania until they moved to Illinois in September, 1970. In August, 1971, after the onset of marital difficulties, the Stottlemyers returned to Pennsylvania and took up separate residences there. On November 16, 1971, the appellant filed a complaint in [506]*506divorce against the appellee in the Court of Common Pleas of York County. From the averments of the complaint it is apparent that neither Marian Stottlemyer, the plaintiff, nor her husband had resided in Pennsylvania for one full year immediately prior to the commencement of the action.
Appellee filed preliminary objections asserting that because the residency requirement of the Act of 1929, supra n.l, had not been met, the court lacked jurisdiction over the cause of action. The trial court sustained the objections and dismissed the action. The Superior Court affirmed, per curiam.3 We granted allocatur because of the important constitutional questions presented.4
Appellant makes essentially two arguments in support of her position that the residency requirement is invalid. The first is that the statutory classification, by distinguishing between those domiciliaries who have [507]*507lived in tlie state for one year and those who have not, violates her right to the equal protection of the laws in that it impedes her right of interstate travel and is not necessary to promote any compelling state interest. Appellant’s second argument is that the statute infringes her right to due process of law by denying her access to the courts for the purpose of obtaining a divorce. We are unable to agree, and will therefore affirm.5
I.
Appellant’s first challenge to the constitutionality of the residency requirement is based upon her right to the equal protection of the laws. At the outset, it is important to bear in mind that the equal protection clause has never stood for the absolute proposition that states may not classify individuals for different treatment. Traditionally, state statutory classifications have been upheld if they “bear some rational relationship to a legitimate state end. . . .” McDonald v. Board of Election, 394 U.S. 802, 809, 22 L.Ed.2d 739, 745 (1969). See also San Antonio Independent School District v. Rodriguez, 411 U.S. 1, 55, 36 L.Ed.2d 16, 56 (1973); McGinnis v. Royster, 410 U.S. 263, 270, 35 L.Ed.2d 282, 288-89 (1973). In recent years, however, classifications which either are based upon certain suspect criteria or are violative of certain fundamental rights have been subjected to a stricter standard of review; such classifications have been upheld only if found necessary to promote a compelling state interest.6 [508]*508Thus, the threshold inquiry in the determination of this case, as in any case in which a denial of equal protection is charged, is which standard of review is to be applied.
It is appellant’s position that the residency requirement in divorce actions must be subjected to the strict scrutiny of the “compelling state interest” test because it penalizes the exercise of her constitutional right of interstate travel. Although not guaranteed by any express provision in the Constitution, the right to move freely from state to state has long been recognized as a basic right of every American. United States v. Guest, 383 U.S. 745, 757-58, 16 L.Ed.2d 239, 249-50 (1966). “[T]he nature of our Federal Union and our constitutional concepts of personal liberty unite to require that all citizens be free to travel throughout the length and breadth of our land uninhibited by statutes, rules, and regulations which unreasonably burden or restrict this movement”. Shapiro v. Thompson, 394 U.S. 618, 629, 22 L.Ed.2d 600, 612 (1969). Finding that some residency requirements impinge upon this freedom of movement within the United States, the Supreme Court has struck down as violative of the equal protection clause state statutes imposing one-year residency requirements [509]*509as conditions to the receipt of welfare benefits, Shapiro v. Thompson, supra, to the exercise of the right to vote, Dunn v. Blumstein, 405 U.S. 330, 31 L.Ed.2d 274 (1972), and to eligibility for non-emergency hospitalization and medical care, Memorial Hospital v. Maricopa County, 415 U.S. 250, 39 L.Ed.2d 306 (1974). In each of these cases, the Court has indicated that any statutory classification which “penalizes” the exercise of the right of interstate travel must be supported by a compelling state interest. Shapiro v. Thompson, supra at 634, 22 L.Ed.2d at 615; Dunn v. Blumstein, supra at 339, 31 L.Ed.2d at 282; Memorial Hospital v. Maricopa County, supra at 258, 39 L.Ed.2d at 315.
While it has thus been protective of the right to travel, the Court has, however, made it clear that residency requirements are not per se invalid. Memorial Hospital v. Maricopa County, supra at 256, 39 L.Ed. 2d at 314. Indeed, many such requirements may not even constitute “penalties” upon interstate travel and therefore may not bring into play the strict scrutiny of the “compelling state interest” test.7 For example, in Vlandis v. Kline, 412 U.S. 441, 37 L.Ed.2d 63 (1973), while it invalidated a Connecticut statute providing for certain irrebuttable presumptions relating to student residency,8 the Court indicated that reasonable [510]*510residency requirements as conditions of eligibility for in-state tuition rates could be imposed due to the “special problems involved in determining the bona fide residence of college students who come from out of State to attend that State’s public university”. Id. at 452, 37 L.Ed.2d at 72. As illustrative, the Court cited its earlier summary affirmance of a federal district court decision upholding the constitutionality of a University of Minnesota regulation requiring that students be bona fide residents of Minnesota for one year as a condition to eligibility for in-state tuition rates. See Starns v. Malkerson, 326 F. Supp. 234 (D. Minn. 1970), affirmed, 401 U.S. 985, 28 L.Ed.2d 527 (1971).9 Similarly, in Hadnott v. Amos, 401 U.S. 968, 28 L.Ed.2d 318 (1971), the Supreme Court affirmed a district court decision which, although invalidating Alabama’s voter residency requirement, upheld a residency requirement for circuit judge candidates. See Hadnott v. Amos, 320 P. Supp. 107 (M.D. Ala. 1970).
[511]*511Thus, the question of whether the “compelling state interest” test is to be applied in a given case where durational residency is involved depends upon whether the particular requirement under review imposes a penalty upon interstate travel. The question is not free of difficulty. As the Supreme Court acknowledged in its latest decision in this field, referring to its own decision in Shapiro v. Thompson, supra, “The amount of impact [upon travel] required to give rise to the compelling state interest test was not made clear.” Memorial Hospital v. Maricopa County, supra at 256-57, 39 L.Ed.2d at 314. The Court also implicitly recognized that the “ultimate parameters of the Shapiro penalty analysis” have not yet been defined. Id. at 259, 39 L.Ed.2d at 315.
Nevertheless, an examination of the three major Supreme Court decisions involving state residency requirements sheds some light upon the penalty concept. Shapiro v. Thompson, supra, involved welfare benefits, which for many persons are the sole means of obtaining the basic necessities of life. In Dunn v. Blumstein, supra, it was the right to vote which was involved, a right which the Court described as a “fundamental poiiticaj right” and the “preservative of all rights”. Id. at 336, 31 L.Ed.2d at 280. Memorial Hospital v. Maricopa County, supra, was concerned with medical care, another basic ingredient to the health and welfare of all people. In the case last cited, the Court emphasized that “governmental privileges or benefits necessary to basic sustenance have often been viewed as being of greater constitutional significance than less essential forms of governmental entitlements”. Id. at 259, 39 L.Ed.2d at 315. From a study of these decisions we conclude that the extent to which a residency requirement can be said to impose a penalty upon interstate travel is a function of the extent to which the subject matter of the requirement is either a funda[512]*512mental civil or political right or a matter essential to basic sustenance.
The subject matter of the requirement here challenged is the right to seek a dissolution of the marital relationship, i.e., to bring suit for divorce. While this right is indeed important, as the increasing volume of divorces annually granted bears witness,10 and has a direct bearing on personal well being, including in some cases emotional health, we are not persuaded that it is a fundamental civil or political right, or a matter pertaining to the basic sustenance of an individual: it is not of a piece with receipt of welfare benefits, eligibility for hospitalization and medical care, or the exercise of the voting privilege.11 It follows that imposi[513]*513tion of a period of residence as a prerequisite to the exercise of the right is not such a penalty upon interstate travel as to call for application of the “compelling state interest” test. The residency requirement, therefore, is to be judged by the “rational relationship” standard traditional in equal protection challenges.12
The rational relationship analysis requires that a statutory classification “must be reasonable, not arbitrary, and must rest upon some ground of difference having a fair and substantial relation to the object of the legislation, so that all persons similarly circumstanced shall be treated alike.” Royster Guano Co. v. Virginia, 253 U.S. 412, 415, 64 L.Ed.2d 989, 990-91 (1920).13 The application of this test must begin with the identification of the state interests involved in the statute in question. Essentially two state interests are promoted by durational residency requirements in divorce actions. The first is the deep concern of every state in the marital relationships of its domiciliaries. This Court has emphasized that marriage is more than a contract between two individuals; it is a relationship which “invests each party with a status towards [514]*514the other and society at large, involving duties and responsibilities which are no longer matter for private regulation, but concern to the Commonwealth.” Moorehead’s Estate, 289 Pa. 542, 552, 137 A. 802 (1927) (quoting Coy v. Humphreys, 142 Mo. App. 92, 125 S.W. 877 (1910)).
The United States Supreme Court has long recognized this state interest. In Williams v. North Carolina I, 317 U.S. 287, 87 L.Ed. 279 (1942), the Court observed that “[e]ach state as a sovereign has a rightful and legitimate concern in the marital status of persons domiciled within its borders. The marriage relation creates problems of large social importance.” Id. at 298, 87 L.Ed. at 286. Similarly, as to divorce, the dissolution of the marriage relation, the Court in Williams v. North Carolina II, 325 U.S. 226, 89 L.Ed. 1577 (1945), stated, “Divorce, like marriage, is of concern not merely to the immediate parties. It affects personal rights of the deepest significance. It also touches basic interests of society.” Id. at 230, 89 L.Ed. at 1581.
It is important, therefore, that it should be Pennsylvania, and not another state having no interest in the marriage, which exercises divorce jurisdiction in cases in which one of the parties is domiciled in the Commonwealth. Conversely, it is equally important that Pennsylvania refrain from purporting to exercise divorce jurisdiction in cases in which neither party is domiciled in this state. Failure so to refrain would intrude this state into relationships with which it has no interest, but in which one or more other states have a deep and legitimate concern. Such intrusions would be both unnecessary and unfortunate, and could also transform Pennsylvania into what is commonly referred to as a “divorce mill”.
It is because of this recognized interest of the state in the marriage relationship that jurisdiction to dis[515]*515solve it normally requires the domicil in the forum state of at least one or the other party to the action. See Restatement (Second) of Conflict of Laws §§70, 71 (1971).14 This requirement of domicil, or a period of residency in the state which is the virtual eqivalent of domicil, gives rise to the second state interest promoted by divorce residency requirements, namely, that of insuring that a state’s judicial decrees are entitled to and be accorded full faith and credit in a sister state.15 Thus a divorce decree rendered by a court of a state in which neither party is domiciled is not entitled to full faith and credit. Williams v. North Carolina II, supra. And if, in an ex parte divorce proceeding, the forum state assumes jurisdiction because it finds the plaintiff to be domiciled within its borders, that determination is not conclusive upon the courts of another state in a later proceeding involving the defendant spouse if that spouse did not appear in the original divorce action. Such a determination “is entitled to respect, and more”, Williams v. North Carolina II, supra at 233, 89 L.Ed. at 1583-84, but reexamination by the courts of a second state is not foreclosed.16 If upon such a reexamination it is decided that there [516]*516was no domiciliary basis for jurisdiction by the state rendering tbe decree, the divorce is not entitled to full faith and credit. In that event serious problems may arise if one of the parties has purported to remarry. Such a party and his or her new “spouse” may be subject to criminal prosecution for bigamy or adultery. The legitimacy of children may be brought into serious question. In case of the death of a party to either the first or a later marriage, there may be disputes as to which “spouse” is entitled to social security and other death benefits payable to surviving spouses and to the statutory share in the estate of the decedent.17
To summarize: Pennsylvania, like every other state, has a deep concern in the marital status of its domiciliarles. Should it undertake to exercise divorce jurisdiction where neither party is a domiciliary or the equivalent (see n. 14, supra), it would be deciding whether or not to dissolve a marriage in which it has no interest; by the same token, it would be interfering [517]*517with a relationship in which another state or states do have a strong interest. In the process, it would be undermining the strength of its own judicial decrees. Finally, a divorce decree without jurisdictional basis creates serious problems not only for the parties to the original marriage, but also for innocent third persons who become involved as children or by purporting to marry one of the parties or who have legitimate claims to inheritance from one or another spouse. It is a legitimate state interest to seek to avoid such consequences by any reasonable means.18
It may be argued, as indeed appellant does, that all of this is beside the point: conceding that domicil is a prerequisite to divorce jurisdiction, a court should make an independent determination of the domicil of the parties in each case; there is no magic in a year of residence. It is true, of course, that domicil may be acquired in a brief time, and in some rare situations may not be acquired after a year of residence. Simply stated, a domicil of choice is established by the concurrence of (1) physical presence within a state (or other place), and (2) an intent to make a home there. [518]*518Loudenslager Will, 430 Pa. 33, 37-38, 240 A.2d 477 (1968); Publicker Estate, 385 Pa. 403, 405-06, 123 A.2d 655 (1956); Restatement (Second) of Conflict of Laws §§15,16, 18 (1971). But it is a known jurisprudential fact that these requisites are deceptively simple, a¡nd are much more easily stated than applied.19 In particular, whether an individual possesses the necessary intent is often a very difficult question to answer. Generally, the court will consider the expressions of a person, see Publicker Estate, supra, but expressions of intent are not conclusive, see Dorrance’s Estate, 309 Pa. 151, 163 A. 303 (1932). A court will also look to acts and circumstances,20 but the evidence is often ambiguous and reasonable minds may well differ as to the conclusion to be drawn from a particular set of facts.21
[519]*519If the question of domicil is left entirely to a case by case adjudication, the issue will often be impossible to resolve with reasonable certainty that a correct result has been reached or that the determination will not later be overturned in a collateral attack in a second state.22 A one-year residency requirement substantially reduces this uncertainty with more conclusive evidence of intent. Residence in Pennsylvania for one year is itself strong evidence of an intention to remain in the state; and the expressions and actions of a person over a period of a year are obviously more reliable evidence of intent than the expressions and actions of that same person during a lesser period of days, weeks, or months.
In sum, not only does Pennsylvania have strong interests in exercising its divorce jurisdiction only in cases involving its domiciliaries, or those with whom it has ties almost equally strong, but the statutory distinction between those residents who have been in the state for one year and those who have not is reasonable [520]*520and bears a “fair and substantial” relationship to those interests. We hold, accordingly, that the one year residency requirement in divorce actions is not violative of appellant’s right to the equal protection of the laws.
II.
The second basis upon which appellant attacks the one year residency requirement is the Due Process clause of the Fourteenth Amendment to the Constitution of the United States. Principal reliance is placed upon Boddie v. Connecticut, 401 U.S. 371, 28 L.Ed.2d 113 (1971). In Boddie the Supreme Court held it a violation of due process for Connecticut to require that indigents pay fees for filing complaints and effecting service of process in divorce actions.
The Court began its opinion by emphasizing two aspects of the case before it: (1) the basic importance of the marital relationship; and (2) the absolute nature of Connecticut’s exclusion from its courts. Id. at 376-77, 28 L.Ed.2d at 118. The Court then held that “due process requires, at a minimum, that absent a countervailing state interest of overriding significance, persons forced to settle their claims of right and duty through the judicial process must be given a meaningful opportunity to be heard.” Id. at 377, 28 L.Ed.2d at 118. Although the Court concluded that Connecticut could not deny divorces to indigents because they failed to pay the fees, it was careful to point out that it was going “no further than necessary” to decide the case before it. Id. at 382, 28 L.Ed.2d at 122. “We do not decide that access for all individuals to the courts is a right that is, in all circumstances, guaranteed by the Due Process Clause of the Fourteenth Amendment so that its exercise may not be placed beyond the reach of an individual, for as we have already noted, in the case before us this right is the exclusive precondition [521]*521to the adjustment of a fundamental human relationship.” Id. at 382-83, 28 L.Ed.2d at 122.23
Two more recent Supreme Court cases have already delineated limits to the reach of the Boddie decision. In United States v. Kras, 409 U.S. 434, 34 L.Ed.2d 626 (1973), the Court upheld the constitutionality of requiring filing fees as conditions to discharges in bankruptcy. The Court based its decision upon the fact that neither a fundamental interest nor an absolute exclusion was involved. In Ortwein v. Schwab, 410 U.S. 656, 35 L.Ed.2d 572 (1973), the Supreme Court upheld Oregon’s appellate court filing fee as applied to welfare recipients seeking review of decisions of the Public Welfare Division. The Court emphasized that no fundamental interest was involved.
The instant case is similar to Boddie in that it involves dissolution of the fundamental marital relationship. It is unlike Boddie, however, in that there is no danger that any individual will be permanently denied access to the courts. Those moving into Pennsylvania [522]*522will always be able to bring an action in divorce in one year. Since we read Boddie as requiring both a fundamental interest and the threat of a permanent denial of access to the courts, invalidation of the Pennsylvania residency requirement would be a significant extension of the holding of that case. We find no warrant for such an extension, and therefore we decline to make it.24
Order affirmed.