Why did the United States try to limit north vietnams power after it won its independence from France?

What event brought the us into wwii? what conflicts happened after the us entered the war? i know the first part of this question, i need with the second part.

The primary goal of the abolitionist movement was to a) immediately emancipate or free all enslaved people. b) allow the gradual release of enslaved people. c) end the importation of enslaved people from africa. d) make mandatory the education of all enslaved people.

Abody of water that is surrounded by land on three sides and leads to a larger body of water is called