Did the Union's general Sherman march through the Gulf of Mexico?

Answer 1

No, Sherman's plan was to capture Atlanta then move to the Atlantic coast and capture towns and seaports there. He was able to gather many weapons and produce supplies from the retreating Confederates.

By the time he'd finished with Georgia, the desperate locals were already begging him to leave them alone and put the boot into South Carolina - the state that had started the war.

On that point, he was delighted to oblige them, and crossed into South Carolina soon after the fall of Savannah.

The Gulf of Mexico? No. That wasn't in the picture at all, after the liberation of the Mississippi and the ending of the war in the West.