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Subject
- United States21,195
- Slavery12,401
- African Americans12,358
- Legal status12,310
- Presidents9,844
- National security9,734
- Gender8,181
- Gender identity8,100
- Women7,635
- Small business7,361
- United States. Department of Defense7,184
- Terrorism6,972
- Law6,719
- Veterans6,603
- Administrative agencies6,525
- Budget6,055
- Taxation6,006
- World War, 1939-19455,916
- Education5,408
- Indigenous peoples of North America5,165