During the siege of Vicksburg in 1863 the Union Army

A victory at the siege of Vicksburg, Mississippi, in 1863 gave the Union control of the Mississippi River in the American Civil War. Following the Battle of Shiloh in April 1862, General Ulysses S. Grant's Union army moved south. Grant hoped to secure control of the Mississippi River for the Union.

Had a quiz on it.

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explanation:

well the fact it is basically a peninsula allowed trade to come from many places, thus allowing cultural diffusion to take place. india has seasonal monsoons that merchants travel back and forth from india using the monsoons wind patterns