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Subject
- History65
- Immigrants56
- Imperialism48
- Labor41
- Economic conditions38
- Emigration and immigration35
- Industries35
- Industrialization19
- Racism11
- Indians of North America9
- Colonies8
- Ethnicity8
- Politics and government7
- Race discrimination7
- African Americans6
- Asian Americans6
- Political planning6
- Territorial expansion6
- Government policy5
- Policy sciences5