All immigrant groups have lower divorce rates than the US average.
Poorer and less educated immigrants marry just as often, and divorce even less, than richer and more educated ones. This is the opposite of the pattern for Americans generally.
Hispanics have lower marriage rates than average, Asians have higher ones.
These findings, and some very insightful suggestions for exploring the underlying reasons, are in:
Marital Demography: The Immigrant Difference" by Anne Snyder in Family Studies
Based on "U.S. 2010: Divergent Paths of American Families" by Zhenchao Qian of the Sociology Department at Ohio State University, a comprehensive report on marriage, cohabitation, divorce, and remarriage and on many demographic variables and correlations.
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