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- Emigration and immigration[remove]74
- Political science17
- Law8
- History7
- Sociology7
- Citizenship6
- Climatic changes6
- Hispanic Americans6
- Immigrants5
- Education4
- Immigrants--Social conditions4
- International law4
- Asian Americans3
- Economics3
- Human rights3
- Mexican Americans3
- Oral history3
- Russians--Migrations3
- African Americans2
- Child mental health2