History ! question 1  what was america concerned would happen if vietnam became communist? question 1 options: that it's neighboring countries would also fall to communism- fulfilling the domino theory,. that wwii would be lost that american settlements in vietnam would be under communist rule that vietnam's economic collapse would trigger another global great depression. how was vietnam split after wwii? question 2 options: vietnam was unified into one democratic country vietnam was unified into one communist country communist south vietnam democratic north vietnam communist north vietnam, democratic south vietnam