Why did kansas become the battleground over slavery?

it bordered native american territory.
it was the first time slavery tried to move into free territories.
it bordered the slave states of missouri and oklahoma.
there were no slaves living in the territory at the time.

The first ten amendments, known as the bill of rights, protect individual freedoms and limit the power of the federal government. what amendment limits the powers of the state government and extends bill of rights' protections to citizens of a state? a) 12th amendment b) 14th amendment c) 15th amendment d) 17th amendment