What happened after the Union took control of the Mississippi River in July 1863? A. The Civil War ended in a truce.
B. Astalemate had been reached in the fighting.
C. Union forces had the upper hand.
D. The Confederacy turned the tide and won the war.

ANSWER:Vicksburg During the Civil War (1862-1863): A Campaign; A Siege. When Vicksburg fell to Union troops on July 4, 1863, the Confederacy lost its last chance to control the Mississippi River. ... For the Confederacy, control of the lower Mississippi River was vital to the union of its states.

In the midwest because it has more moderate climate than the north or south west which makes farming far easier.