Review the map below. Why is the red line between Missouri and the Arkansas Territory significant?

Pic of Map (sorry) - http://gyazo.com/e08a4ee143df8439761782eb5c6f8bf9

A. The line started the debate that eventually led to the Civil War.

B. The line gave Congress much needed control over the politics of the rapidly growing Midwest.

C. The line was important in completing the Mason- Dixon line between the North and South.

D. The line established a boundary to keep the slave states and the free states balanced in Congress.

Question

Review the map below. Why is the red line between Missouri and the Arkansas Territory significant? 

Pic of Map (sorry) - http://gyazo.com/e08a4ee143df8439761782eb5c6f8bf9

A. The line started the debate that eventually led to the Civil War. 

B. The line gave Congress much needed control over the politics of the rapidly growing Midwest. 

C. The line was important in completing the Mason- Dixon line between the North and South. 

D. The line established a boundary to keep the slave states and the free states balanced in Congress.