Step 1: Build Walls and Border-stations 360 degrees around the nation, put guns in them, put men on guns.
Step 2: Switch armed forces to Defense, at home and in Allied nations only.
Step 3: Set up the BIG, big guns.
Step 4: ???????
Step 5. Profit!
Trade for what we need, sell what others want, be as self sufficient as possible, and **** everyone but our closest allies.