Question

1. the union started to control the mississippi river when troops captured ______.chancellorsvillegeorgiavicksburggettysburg

Explanation:

The Union's capture of Vicksburg, a strategic Confederate stronghold on the Mississippi River in 1863, split the Confederacy and gave the Union full control of the river. Chancellorsville and Gettysburg were major land battles not tied to Mississippi control, and Georgia is a state not a key river stronghold for this goal.

Answer:

Vicksburg