The US never invaded Vietnam.
no they invaded us
The US didn't invade South Vietnam. The Republic of South Vietnam asked for US help as they couldn't stem the Red Tide (communist infiltration).
To stop the spread of communism.
The Japanese invade Indochina, also known as Vietnam, in 1940.
If we invade North Vietnam, the chances would have been, China & stupid Soviets enter the war and start a WWIII.
The US chose NOT to deploy nuclear weapons. (The US did deploy nuclear weapons against Japan in WWII). The US chose NOT to invade North Vietnam. (The US did invade North Korea during the Korean War).
Yes; invade the north and/or use nukes.
Yes,yes they did.
When the US declared to invade Cambodia during the Vietnam War. They were afraid that the US was going to jump into another war, the way they did during Vietnam.
Could not invade N. Vietnam. Could not use nukes.