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The chart below has been created to help you determine which time period your ancestor may have arrived in the United States.
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Spanish, French, English, African, Dutch, German, Welsh, Finnish, Scottish, and Scotch-Irish
The same groups as the colonial period but in decreasing numbers. This was due to international wars and immigration restrictions.
Catholic Irish, Norwegian, Swedish, Danish, German, Chinese, Japanese, and French Canadians.
Italian, Polish, Austrian, Czech, Slovak, Yugoslav, Romanian, Russian, Hungarian, Armenian, Greek, Arabs, Jews, and Japanese.
German, Italian, Polish, Czech (especially between 1921 and 1930); British (which includes: English, Scottish, and Welsh) and Irish; Canadian and Mexican; and refugees from Nazi Germany. In 1915 immigration once again declined due to the restrictions ( which included literacy tests). Migration was most common in the 1920's.
Mexican, Central and South American, Caribbean, Korean, Vietnamese, Laotian, Cambodian, Middle Eastern Arab, and Soviet Jewish.
NOTE: During most of the periods immigration from Canada was high and included many British and other European migrants.