How did the introduction of the horse to north america by the spanish change the lives of native americans? a. southwestern indians could plow their fields more quickly. b. eastern woodland indians drove the spanish off their lands. c. plains indians could travel farther and conduct more trade. d. pacific northwest indians could hunt buffalo more efficiently.

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.