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Subject
- Immigrants770
- Emigration and immigration371
- History233
- Social conditions153
- Economic conditions81
- Government policy79
- Ethnic relations56
- Social aspects56
- Emigration and immigration law52
- Race relations49
- Noncitizens47
- Labor43
- Politics and government41
- Citizenship38
- Imperialism37
- Industries35
- Minorities27
- Hispanic Americans25
- Jews25
- Americanization24