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Subject
- Imperialism51
- History45
- Socialism and motion pictures38
- Immigrants37
- Labor34
- Economic conditions29
- Industries28
- Emigration and immigration18
- Industrialization18
- Colonies9
- Indians of North America7
- African Americans6
- Race discrimination5
- Racism5
- Ethnicity4
- Asian Americans3
- Territorial expansion3
- African American soldiers2
- Civil War, 1861-18652
- Commerce2