Why did the United States get involved in the war?
The U.S. was attempting to keep Communism from spilling over from North Vietnam to South Vietnam (one of the other posters referenced the "Domino Theory," which suggested that if one country became Communist, another could become Communist, and so on and so forth, like toppling dominoes).
North Vietnam won the war and achieve their goals of reuniting and gaining independence for the whole Vietnam . Where South Vietnam under the support of the U.S. lost the war.