Why were most of the Civil War battle fought in the Confederate states?

Most battles in the War Between the States were fought in the South was partly the result of the decision to blockade the Confederate State to prevent the South from getting supplies from nations like Great Britain and because Ulysses Grant decided to campaign for incursions into Southern territories to disrupt their infrastructure and destroy their garrisons (like the port of Memphis on the Mississippi) .

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

they were all fought in the middle east during ww1