20 points to the person with best answer with explanation

canals and railroad lines were similar because

a. they opened settlement in the west.

b. they were mostly located in the north.

c. they were mostly built in the south.

d. they opened trade to the south.

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.