From 1870 to 1940, racial eligibility for naturalization in the United States was limited to "free white persons" and "aliens of African nativity and persons of African descent," and many interpreted these restrictions to reflect a policy of Asian exclusion based on the conclusion that Asians were neither white nor African. Because the distinction between white and Asian was considerably unstable, however, those charged with the interpretation and implementation of the naturalization act faced difficult racial classification questions. Through archival research and a close reading of the...