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Across
  1. 3. First Black president
  2. 5. Indian Removal Act
  3. 7. Impeached in the '90s
  4. 9. Civil War general president
  5. 12. Second U.S. president
  6. 15. Watergate scandal president
  7. 16. Assassinated in office
  8. 19. Dropped atomic bomb
  9. 22. Civil Rights Act signer
  10. 23. Pardoned Nixon
  11. 24. Louisiana Purchase
  12. 25. Assassinated in 1963
Down
  1. 1. Pre-Civil War president
  2. 2. Doctrine namesake
  3. 4. Teapot Dome scandal
  4. 6. Silent Cal
  5. 8. First U.S. president
  6. 10. Gulf War leader
  7. 11. "Tear down this wall"
  8. 13. League of Nations advocate
  9. 14. Chief Justice post-presidency
  10. 17. Emancipation Proclamation
  11. 18. Great Depression president
  12. 20. New Deal initiator
  13. 21. Father of the Constitution