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Subject
- History126
- Politics and government111
- United States. Congress69
- Legislators46
- United States. Congress. House38
- Political aspects28
- United States. Congress. Senate26
- Slavery25
- African Americans17
- Political and social views17
- Antislavery movements15
- Race relations14
- Civil rights12
- Law and legislation12
- Elections10
- Legal status, laws, etc10
- Extension to the territories9
- African American legislators8
- Prints8
- Prints, American8