The United States has such a large GDP because 1/3 of it is the private healthcare industry. Another massive chunk is the government throwing tax dollars at a shell company of a shell company of a shell company that moves a government contract for construction around to each other 4 times, all subsequently increasing GDP.
You're right, it's actually a genocide zone, so that's your comparison for you.
And if you wanna go there, CW(genocide):
spoiler
the Nazis built better shit in their own genocide zones
so all in all this is a complete dunk for amerikkka.