This was the cold war. The US didn't want communist victories everywhere!
It was obvious North Vietnam wasn't going to quit; so the US declared victory and went home (from the GI's perspective).
Like Korea; a north and south Korea divided at the 38th parallel. Only it would be a north and south Vietnam divided at the 17th parallel.
The Tet Offensive had a significant impact on the Vietnam War, as it resulted in a steep decline in support for the war among the American public. The US and South Vietnam actually won a tactical victory, however, it was a political victory for North Vietnam.
The fear of being invaded was not a justification for the increase in US involvement in Vietnam. The US withdrew from Vietnam in 1975.
Vietnam became Vietnam in 1975. Prior to 1975, there were two nations: North Vietnam & South Vietnam. In the spring of 1975, South Vietnam experienced a conventional military invasion consisting of tanks and infantry from North Vietnam. This invasion ended in a military victory for North Vietnam on 30 April 1975. Therefore, on or about 30 April 1975, North & South Vietnam began it's transition from TWO COUNTRIES into one country (nation)...Vietnam.
North Vietnam was controlled by communists.
"Peace with honour". He wanted Vietnam to become 2 separate states, with S. Vietnam independent of the north . He wanted the exit to at least have the appearance of victory , as he knew that the US could not really win the war.
The US. Only the US was bombing North Vietnam. Although American and Australian men 'o war were bombarding North Vietnam along their coastline.
North Vietnam threatened South Vietnam. I.S.
The US was an ally of South Vietnam; it was up to South Vietnam to repel the invasion from the north, with massive military assistance from the US (which, of course, ultimately failed).
north Vietnam took over south Vietnam
The US wanted N. Vietnam to stop fighting in S. Vietnam.