how has feralism changed over the years? How did the civil war change federalism?

Answer 1

Assuming you mean in the USA, in summary the power of the federal government has gained more authority over the states gradually over time.

Specifically, following the Civil War, amendments to the Constitution significantly empowered the power of the federal government. The overall claim of the Civil War was that the states were legally subject to the final dictates of the federal government.

Answer 2

The civil war gave the federal government more power over the state government. Prior to the civil war, most states believed they had a choice to leave the Union if they so chose