The open door policy was a response to the
a. chinese fear of foreigners.
b. american fear that other nations would prevent them from trading in
china.
c. american desire to keep european nations out of the western
hemisphere.
d. japanese desire to increase trade with the united states.

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.