D
<span>Why did the development of the time zones make train schedules more reliable
A) time zones set the entire country to the same time
B) Time zones measured time locally instead of country-wide
C) Time zones made sure that each state was in only one zone
D) Time zones created a standard of time that all trains follow
D</span>
Don’t listen to the other person, I think they’re trying to hack or something, the answer should be A, is rugged, difficult place
Answer: Smuggling was necessary to the survival of the Spanish colonists who were irregularly supplied by the Spanish traders.
Explanation:
