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I assess whether intermarriage between Protestants and Catholics has increased over the course of the twentieth century and, if it has, whether the declining salience of religious boundaries has been accompanied by a rising importance of educational boundaries in spouse selection. By analyzing a set of national surveys that were conducted between 1955 and 1989 and using a research design that separates the effects of period and duration of marriage, I examine changes over a longer period of time than any previous study has done. Multivariate loglinear analyses show that intermarriage between Protestants and Catholics has increased dramatically since the 1920s, while intermarriage between different educational groups has decreased. Currently, the social boundaries that separate educational groups seem to be stronger than the boundaries that separate Protestants and Catholics. In addition, there is some evidence that interfaith marriages have become increasingly homogamous with respect to education, suggesting that education has replaced religion as afactor in spouse selection.

Trends in assortative mating were examined using the 1% Public Use Microdata samples (PUMS) of the 1940 1960 1970 and 1980 US Censuses and the Current Population Surveys (CPS) of 1985-87. 2 samples were drawn: 1) couples between the ages of 16-34 years and married for the 1st time 1 year prior to the census or CPS (newlyweds) and 2) couples between the ages of 21-39 years and married 5-6 years prior to the census/CPS. The methods of Hauser and Johnson are used to analyze trends that distinguish patterns of change in marginal distributions of husbands and wives traits from those which show an association between spouses traits. These "crossings" models indicate which educational differences between prospective spouses are serious barriers to intermarriage and reflect patterns of change between years. The implications are that marriages between persons who differ in educational attainment may be more common at some levels of the educational hierarchy than at others and that the effect of the time gap between school leaving and marriage is greater at higher levels of schooling than at lower levels. The proportion of marriages with spouses of the same educational attainment declined between 1900-50 and increased from 1950 to 1970 which was due to distributions of spouses schooling rather than from the association between spouses attainment. There is further discussion of the effects of changes in the timing of schooling and marriage and changing competitiveness of the marriage market. The results take into consideration log linear models that relate to the trends in schooling and educational assortative mating and that relate to the timing of marriage and educational assortative mating. The findings suggest that even after the relative timing of leaving school and entry into marriage are accounted for the trend remains for increased educational assortative mating particularly for college graduates and persons without college degrees. Although not empirically tested it is suggested that changes in rates of participation in the armed forces in rates of childbearing before marriage in the incidence of cohabitation in womens labor force participation and in the status of jobs held by women affect the timing of marriage and exposure to potential spouses of varying educational statuses. There may also be an influence on patterns of assortative mating. When barriers to marriage between educational strata increase between family inequalities increase and the effects on family inequality and educational mobility require further analysis. The findings suggest however that the structure of marriage and inequality within and between generations are affected by trends in age at marriage.

Using national data on white ever-married women under forty-five, differentials in marital instability are examined for several of the wife's characteristics at first marriage and for the couple's combined age, education and religion. Dummy variable multiple regression is used to adjust for the effects of differing durations since first marriage and to obtain effects for each variable net of other variables. With other variables controlled, an inverse age at marriage-instability relationship persists; and differences in marital stability by education appear largely attributable to differences in age at marriage by education. Other characteristics we considered are the wife's religion while growing up, whether she grew up on a farm, whether she lived with both parents at age fourteen, whether she was pregnant before her first marriage and whether her first husband had been married before. When we included the husband's variables, we found husbands age at marriage and education to have a negative relationship with marital instability. Higher instability for intermarriage is found among couples divergent in age or religion; only extreme differences in education are associated with higher instability.

The literature on social stratification refers on occasion to inter-class marriage as the "acid test" of class mobility. This paper examines that proposition using Italian national-sample survey data on four socio-political perspectives: the respondent's perception of 1) the different distribution of rewards in society, 2) the degree to which class boundaries restrict social intercourse, 3) the character of inter-class relations, and 4) the interest representations of political parties. Evidence supports the proposition. In addition, rates of heterogamy are reported, and the relationship of heterogamy to career entries is examined.