The 1924 Immigration Act, then, had an explosive effect. On the one hand, the limits it placed on the numbers of European and Asian migrants who could enter the United States reinforced Mexico’s importance as a source of cheap labor for the United States’ expanding economy. On the other hand, it created an agency—the U.S. Border Patrol—that institutionalized a virulent form of nativism and concentrated its animus on Mexican migrants.
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