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SAT US History Practice Question

The immediate cause of U.S. military involvement in the Korean peninsula in 1950 was the

  1. A.crossing of the Yalu River by the Chinese "volunteers."
  2. B.Japanese invasion of Manchuria.
  3. C.creation of the DMZ (demilitarized zone) along the 38th parallel.
  4. D.acquisition of a nuclear weapons by North Korea.
  5. E.attack by North Korea on South Korea.

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