Question

The first battleground between those favoring the extension if slavery and those opposing it was where ?

Answer 1

Kansas.

Answer 2

Bleeding Kansas.

Answer 3

Well if you mean politically it was kansas. everyone flocked to the state when it was first made so that they could vote to pass or deny slavery. But if you mean In the civil war. the first battle that the north and south fought was over fort sumter and the first major battle was the first battle of bull run.