He was a teacher and he was very logical so the right answer for this I believe would be logically. It makes the most sense because all the other answers aren't what he is known for.
Do you mean absolute monarchy?
It's being ruled by one person
The progressives seek to eliminate government corruption because the government officials were concerned that it was hurting the tax system. Their major goal was to correct abuses of the big business. The effect of this was that, government regulation of business increased during the progressive era.
Definitely The Grand Army of the Republic
Accessibility refers to things that help people with disibilities. ex. A wheelchair.