The interbreeding is too slow at present to be conspicuous, and hence
its effects are little noticed. The foreigners tend to keep by
themselves, to form "Little Italies," "Little Russias," transplanted
Ghettoes and "foreign quarters," where they retain their native
languages and customs and marry compatriots. This condition of
segregation can not last forever; the process of amalgamation will be
more rapid with each generation, particularly because of the
preponderance of males in the newer immigration who must marry outside
their own race, if they are to marry at all.
The direct results of immigration that lead to intermarriage with the
older population are fairly easy to outline. The indirect results, which
we shall now consider, are more complex. We have dealt so far only with
the effects of an immigration that is assimilated; but some immigration
(that from the Orient, for example) is not assimilated; other
immigration remains unassimilated for a long time. What are the eugenic
consequences of an unassimilated immigration?
The presence of large numbers of immigrants who do not intermarry with
the older stock will, says T. N. Carver,[149] inevitably mean one of
three things:
1. Geographical separation of races.
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