How did the domino theory influence the united states' role in the vietnam war? vietnamization.
a) became the new u. s. foreign policy.
b) the united states adopted a position of neutrality.
c) it forced the united states to support the vietcong.
d) it convinced the government to become inv

How did the spanish-american war affect american expansionism? a.) america took control of hawaii, cuba, and the pacific islands of guam. b.) america took possession of cuba and the philippines. c.) america gained control of puerto rico and hawaii. d.) america gained control of cuba, puerto rico, the pacific island of guam and the philippines.