A review of previous research leads to the conclusion that there has been only a minimal decline in interethnic segregation (e.g., Irish from Italian immigrants) in U.S. cities since 1930. Moreover, an analysis of the New York-Northwestern New Jersey Standard Consolidated Area census tract statistics indicates that interethnic segregation remains relatively high into the second generation. This suggests that white resistance to racial integration may but compound the strong separatism of ethnic populations from one another.
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Nathan Kantrowitz (1969) studied this question.