What was the Union military’s reason for wanting to control Louisiana during the Civil War?

Once war was declared, the Union's objective in Louisiana was to gain control of the Mississippi River, forcing Confederate troops to defend Louisiana and prevent Federal troops from dividing the eastern and western parts of the Confederacy along the Mississippi.

Explanation:

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powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.