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.

Which of the following statements about slavery is not accurate? a. slavery in the americas was no different than slavery in ancient greece or rome. b. beginning in the 1600s, slaves began to be viewed as property, rather than people. c. slavery did not originate in the americas. d. slavery was very important to the economy of the american colonies.