Answer:
The reason was that the tensions, and the subsequent victory of the Union Side in the Civil War allowed the government of Abraham Lincoln to end slavery in the United States.
In other words, he had enough political capital because he had the backing of both union politicians and the people due to the need of leading the war against the Confederate Side in the Civil War.
Robber barons were both good and bad. On the one hand, they created enormous wealth and opportunity. On the other, they drove numerous small competitors out of business, damaged the environment, and generally treated their workers very badly.
It made it easier to build up your gardens faster
