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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I'd say we lose, after a long while. Asking this question, you're forced to also consider the fact that we have more civillians with guns than any other country, on top of our law enforcement. Regardless of your politics, our right to arms was designed for large scale invasions like this. Capturing the country, as hard as that might be considering our advanced military, is the easy part. Staying in control is much tougher.