I think the answer is true
The third may not be an effect
Time zones first came about by that American railroads maintained many different time zones during the late 1800s. Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals. Four standard time zones for the continental United States were introduced on November 18, 1883.
Answer:
A
Explanation:Use slave labor to take over Northern industries
