In a fight against every other country in the world. Now when i say fight, i mean holding our ground. All our of troops and forces are here and we have to keep everyone else out. The rest of the world would have to take most of the major cities and Washington D.C.
All of the US military from around the world is brought back and deployed around our country. With all the weapons in civilian hands as well, how long would the United States last?
[url=http://www.globalfirepower.com/]Here are stats on every major military in the world. [/url]
Also, No nukes aloud.
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Not very long. Look at the EU's military, along with every other country in the world. If it was a fight till every citizen in America was dead, then it'd take a while, but if it was just a matter of winning or losing, then the United States would probably surrender.