immigration to the United States remained insignificant in the 1950s, averaging only 250,000 a year during the decade. Ellis Island, the nation's preeminent immigration center, closed in 1955.49 Most "ethnic" Americans, moreover, continued to be white in skin color and of European background. In 1960 the most numerous groups of people with a foreign or mixed parentage had hardly changed since 1945. They continued to be German- and Italian-Americans (approximately 3.3 million each), followed by people with roots in Canada, Poland, Britain, Russia, and Eire. Mexican-Americans ranked next, well
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