The Historical Regulation of International Migration:

When estimates of illegal immigration (between 2 and 3 million) are added to the official number of immigrants, it is probable that more immigrants entered the U.S. in the 1980s than in any other decade. In sum, the U.S. has experienced two great waves of mass immigration, the first classic era between 1880 and 1930 and the second new regime ... ................
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