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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The only way i can see the world crippling the U.S's Navy would be somehow taking out the Norfolk Naval Base But even getting near it would cause way too many causalities as Hampton Roads is full of Military and the shipyard has 15+ Destroyers docked there iirc.