Why did the United States military first become involved in Vietnam

To stop the spread of Communism.

Explanation:

During the Cold War, the U.S.S.R. and the U.S. were fighting to decide if Capitalism or Communism would be the dominant market type.  The U.S. entered Vietnam to help fight out the Russians who were trying to establish a Communist government there.

two months after his defeat of napoleon bonaparte's colonial forces, jean-jacques dessalines proclaims the independence of saint-domingue, renaming it haiti after its original arawak name. in 1791, a slave revolt erupted on the french colony, and toussaint-louverture, a former slave, took control of the rebels.

the united states didn't wanted to get involve with other countries probelms