The US entered the Vietnam to end Communism or to prevent it from spreading like a plague. This is the most simple way to answer this question.
Vietnam was still considered French territory but at some point there was an insurgency, which was lead by the communists. There is a term that was used to describe the spread of communism and that was called the Domino Theory. The Domino Theory states in layman's term that if communism took over Vietnam it would then spread to other Asian nations like it had in Eastern Europe.
Georgians were pleased that slavery would be protected and there would be a bicameral legislature. The delegation from Georgia worked to make both larger and smaller states happy with their representation and they worked to have slavery protected in the Constitution.
Buddhism was basically transmitted to other nations by teachers, researchers, exchange, resettlement, and communication systems.
Buddhism was as of now declining in India by the 12th century, but with the plunder by Muslim intruders it about got to be terminated in India within the 1200s. After the collapse of ascetic Buddhism, Buddhist locales were deserted or reoccupied by other devout orders.