Why did South Vietnam fall to the communists after the Paris Peace accords?

Hope this helpsExplanation:Why did South Vietnam fall to the communists after the Paris Peace accords? North Vietnam refused to sign the treaty until U.S. troops left South Vietnam. Hanoi surrendered but an uprising in the south brought a communist government to power.

Split Europe in two. Imperial Russia and Western Europe were split by the two nations of the German Empire and the Austro-Hungarian Empire.