"which of the following was the name for roosevelt and churchill's agreement to collective security, disarmament, freedom of the seas, and economic cooperation?
a. yalta conference
b. potsdam conference
c. atlantic charter
d. tehran conference

How did the united states respond when north vietnam attacked a us warship and sent troops to south vietnam in the early 1960s? a. the united states declined to assist south vietnam against the north. b. us leaders authorized south vietnam to invade north vietnam. c. the president did not sign the gulf of tonkin resolution. d. congress authorized the president to escalate the conflict.