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because it is historical
Communist infiltration into South Vietnam.
Historical reasons of poverty in india
to fight communism
Vietnam did not hate the Khmer Rouge. The main reasons that Vietnam sent troops to help defeating the Rouge are considered of 2 reasons: 1/ Vietnamese troops will loot resources from area that they travel by. 2/ Cambodia is Vietnam's close neighbour, and the Khmer might attack the borders of Vietnam.
For historical reasons.
Ignorance...
"How did America's historical development give it an advantage over the British super power" during the American Revolutionary War in 1776?" As you can see that statement can be applied to almost any nation during any time in history. Answer to your question: It had nothing to do with it. The US did not win the Vietnam war for 3 reasons; 1) Couldn't isolate the battlefield (war), 2) Couldn't invade the enemies homeland (North Vietnam), 3) Couldn't use nukes.
= Find out 10 reasons sin is prevalent in our present days? =
something to do with the British.
There was a war going on.
Part of the cold war.