More soldiers were able to survive the vietnam war because a. more women enlisted to become nurses b. wounded soldiers were able to be evacuated quickly on helicopters c. technology did most fighting for soldiers d. american soldiers saw little combat

the completion of the erie canal spurred the first great westward movement of american settlers, gave access to the rich land and resources west of the appalachians and made new york the preeminent commercial city in the united states.

b. the 200th birthday of the united states