Answer:
Its members waged an underground campaign of intimidation and violence directed at white and Black Republican leaders. Though Congress passed legislation designed to curb Klan terrorism, the organization saw its primary goal–the reestablishment of white supremacy–fulfilled through Democratic victories in state legislatures across the South in the 1870s.
Number 1 is c
number two i have no idea
number 3 is c
Congress could not draft soldiers or regulate trade
because it had to deal with slavery and they did not want to end it so they attempted to stop congress