However, except for Chinese exclusion, prior to World War 1, as historian Mae Ngai points out, the United States had virtually open borders; immigration was encouraged and unfettered.39 In the wake of the US entering the European war, xenophobia surged, and the US Congress in 1917 enacted an extremely restrictive immigration law that became the basis of the comprehensive Immigration Act of 1924 (the Johnson-Reed Act, Asian Exclusion Act, and National Origins Act), the primary determinant of eligibility for citizenship being whiteness, under the guise of “the nationality of the immigrant.”40
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