Gaining control of the Mississippi River would allow the northern region to keep the support of the border states.
Who are the North (Union army)?
The Union army are the soldiers who fought for the Northern region during the Civil war. They army hoped to secure control of the Mississippi River for the Union.
They believed that having control of the river would split the Confederacy in two and control an important route to move men and supplies since the last major Confederate stronghold on the Mississippi River was the city of Vicksburg, Mississippi.
Hence, the Option A is correct because gaining control of the Mississippi River would allow the northern region to keep the support of the border states.
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