What do you consider the greatest advancement during the time period post-Reconstruction? Why?

In my opinion the Compromise of 1877 was the most important in the end of reconstruction era because it’s main focus was on bringing the southern states back into full political participation in the Union, guaranteeing rights to former slaves and defining new relationships between African Americans and whites.

In the midwest because it has more moderate climate than the north or south west which makes farming far easier.