The world doesn't rely or revolve around America. Heart breaking, i know. I don't know of a single product (not saying there aren't any) that comes from America that I buy during my weekly shop. We get shit from Europe, Africa and AUS/NZ.
Your financial institutions would move to Hong Kong, Beijing or more likely London. America pulling troops back home from the UK, Europe, Mid-east and Russian borders wouldn't cause any of the nations to flood in and attack anyone. It would be the biggest de-escalation in history and would usher in a peroid of peace, seems as most of the wars around the world are started by America. Overtly using the US army or covertly using the CIA et al
The rest of this and every sperg-post you've made about foriegn nations coming in to help/attack you are pure autism. If America kicks off in to a civil war, the world wouldn't give a fuck. You're on your own, for better or worse.
Your fantasy of thinking people would come to your country to fight you are triple-distilled, unfiltered retardation. Our tactics would be to sit back and watch while you kill yourselves. Which would be the tactics of every other nation. Why do you think coups like the arab spring work so well? They need zero foreign troops or resources to acheive the same goal of destabilising/destroying a country.
Your posts are usually sound but this topic has sent you in to spastic over-drive. Go camp out for a week and clear your head.