American history

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Across
  1. 5. The continent black people were 'imported' from
  2. 7. The first big war for American independence
  3. 9. Hot water and vapour coming out from the ground in the USA
  4. 10. The worst internal American conflict
  5. 11. A famous American natural park
  6. 13. The American Parliament
  7. 14. The name of the America flag
  8. 15. The President who abolished the slavery
  9. 16. The residence of American Presidents
  10. 17. The day which celebrates the first harvest in America
  11. 19. The name and surname of Mel Gibson in 'The Patriot'
  12. 20. It was created by Colorado river and wind through time
  13. 22. Black people used to work there
  14. 23. The name of an 'indian' tribe in America
Down
  1. 1. The first American President
  2. 2. The name of the first state in America
  3. 3. American 'Indians'
  4. 4. The name of Southern soldiers
  5. 6. The black woman who didn't give her seat on a bus
  6. 8. The country from which the first colonists came from
  7. 12. He died for the blacks' rights
  8. 16. The capital of the USA
  9. 18. The name of the Northern soldiers
  10. 21. It started after the abolition of slavery