I believe it's the first option and the fourth option.
An installation for the manual control of telephone connections in large buildings.
True! Christopher Columbus thought he had reached the west Indies. Instead he discovered the New World.
"<span>d. The Southern plantation economy depended on slavery" is the best option from the list, since although slavery continued to exist to some extent in the North it was the South's primary source of labor. </span>
Answer: C.
eliminated government regulations
Explanation: