Why did America become involved in Vietnam?

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Across
  1. 4. the religion of most Vietnamese
  2. 7. diem's religion
  3. 8. leader of the Viet Minh and North Vietnam
  4. 11. supposed to happen in 1956 - USA helped prevent them
  5. 12. overthrew Diem in a 1963 coup
  6. 14. anti French communist resistance group
  7. 15. vietnam was divided along this parallel
  8. 16. peace accords signed here in 1954
Down
  1. 1. french defeated here
  2. 2. What the French called Vietnam, Laos and cambodia
  3. 3. president of USA 1953-1961
  4. 5. 'fell' to Communism in 1949
  5. 6. USA helped him set up South Vietnam in 1955
  6. 9. diem did this (appointed family & friends to power)
  7. 10. theory that if Vietnam fell, other countries would
  8. 13. diem was from this class
  9. 14. Communist group in South Vietnam, supplied by north