Gaining control of the missisipi river during the civil war would allow the north to

It'd allow the North to control goods going down the river to the South. Doing this, the North could cut off food or weapon supply to "starve out" the other side. The North could also use the Mississippi for transporting their own troops into battle.

the correct answer is d- trough trades

i did a test and got it right

hope it ! : )