Immigration and intermarriage
Immigration is making intermarriage less likely for minorities. Statistics Canada summarizes: "When co-religionists are scare, inter-religious unions are more likely."
Similarly, in the U.S. the highest proportion of blacks are in interracial marriages in states like Wyoming where there are very few blacks.
In contrast, in Canada, the percentage of Jews in mixed marriages climbed from 9% in 1981 to 17% in 2001. The Canadian government points out the assimilating effects of a low immigration rate: "Only 8% of those with a Jewish religion arrived in Canada between 1991 and 2001, so people who have the Jewish religion have a longer history in Canada than many other religious groups."
This is like the phenomenon of how the growth of interracial marriage in California is being slowed by immigration, as I pointed out in 2000. For example, several decades ago, Asian-Americans were widely scattered throughout suburban Southern California, so intermarriage for Asians was high. But recently they've clustered in the San Gabriel Valley east of downtown Los Angeles, which facilitates more Asian-Asian marriages.
As Lenin pointed out, it's useful to ask Who? Whom? A low rate of immigration leads to the assimilation of minorities into the majority through marriage. In contrast, a high rate of immigration helps preserve the cultural and genetic exclusivity of minorities while breaking down that of the majority.
Interreligious unions in Canada
Keeping the faith
Continued Immigration Retards Growth of Interracial Marriage