Answer: After the Civil War ended in 1865, the U.S. rail network grew explosively. This expansion connected distant markets and allowed raw materials to be shipped cheaply and quickly from sources in the West and Midwest to factories in the Northeast.
Explanation:
The answer is D. expensive wars with neighboring tribes.
"<span>Supported by all of the Southern ex-Confederate governments" is the only incorrect statement, since the Radical Republicans were the harshest towards the South and therefore were hated by the ex-Confederates. </span>
They probably had no other choice. During that time, it was hard to get a job with a solid pay for many people (especially immigrants). If they decided to quit, they would have to find other jobs, which probably have bad conditions as well. If they couldn’t find any good jobs, then they would basically become homeless and wouldn’t be able to pay for themselves and their families. (Back then, families were much more important.)