"Figure 8.7 shows the trend, by birth cohort, for the percentage of GSS respondents who said that they were Protestant, Catholic, or Jewish and that their spouse currently espoused a different religion (solid line). It also shows the rates of intermarriage by Protestants across major denominations (dashed line). Note also that the largest change occurred between the 1920 to 1939 and the 1940 to 1959 cohorts, cohorts divided by whether they matured before or after the 1960s."—p. 201, Century of Difference