it could happen. what about a sum of all fears scenario?

Cutting off the oil supply to the US wouldn't work. The United states has enough oil reserves on it's own to last atleast 10 years. So that would only lead to two outcomes. Either the US wins the war before the oil reserves run out or they use the 10+ years to transition to a different energy source. Also attacking the US on US soil may be a strategy that will work for a while but the problem with that is that the US is across giant oceans from any enemy and we have the greatest navy in the world, not to mention countries like China are not exactly set up for mobility across oceans. And thirdly if another militery did invade the US atleast half of the soldiers would abandon their army and try to become citizens here. 

training simulator yo, now where's my gun with R1 for shooting and L1 for aiming, need it ASAP!!!

I feel this game is going to outsell MW1 due to the Cool story line

I don't like being the main detractor, I was merely returning at some previous detractors

However, I shall continue: I would personally argue (and I'm not the only one) that the USA itself is the result of imperial expansion from the east to west of the American continent. You also have Puerto Rico - a US colony. West Germany and Japan were also directly under the USA's control after WWII (let's not forget failed expansionist policies in the Philippines, Cuba, etc).

In short, what I'm trying to say is that the USA has many countries/colonies under its control - its just that they're so deeply integrated they're referred to as states.

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As for Iraq and Afghanistan, you have to consider that the USA isn't putting anywhere near the resources into these "wars" as they could or should. The issue with the USA is that it's a democracy, and its electorate is very much against foreign deployment - probably trickling down from the  isolationist post-WWI days of American policy. Any attack on home soil would not have this issue, and full deployment of military resources would be a much more achievable goal.

Also, due to the USA's navy dominance, no other nation would even be able to touch down on USA soil. I read something like the USA has 12 Super Aircraft carriers, whilst the rest of the world combined has 11. The USA currently has 2 different types of stealth aircraft in deployment, with many more under development: the rest of the world has 0.

Russia could probably mount an invasion on Alaska, due to the closeness - but that wouldn't be in their interest.

In fact, war with America wouldn't be in anyone's interest, so this whole debate is moot*

*I still like it, though, as discussing the potential scenarios interests me.

Yeah, there were seriously people that tried to get the movie named changed because they felt like it was too insensitive to those people affected by 9/11.

And that is one of the many reasons why I hate people.

People do suck.
I seriously doubt that nowhere else in the world are secret or stealth aircraft under development apart from America.

I also doubt that if anyone went to war with America (or anyone else) they wouldn't build up forces or resources first.

Fact is America can't go to war on a serious scale without the worlds backing or else they would have the world to answer to. America isn't as all powerful as we are lead to believe and it has been shown to be true in the past as well as present.
Also no-one can go to war with America without having to face the rest of the world as well.

Or do people believe that if say China and America went at it everyone else would stand back and watch?

Unless America develops a Nazi like attitude of world domination it will have allies and will need them. If it does develop Nazi like dreams of world domination it will have enemies and should fear them.
They aren't as isolated as they think.

or we wish.

With US troops deployed in 156 out of 195 countries, and permanent bases on all - barring Africa - continents, the USA can successfully deploy troops and mount an invasion within hours on most parts of the world. The British Empire worked over weeks/months because the fastest they had to travel and communicate via boats.

The British dominance relied heavily on the Navy, whilst other areas of its military were fairly weak in comparison - and it shows, look at a map of the British empire (http://upload.wikimedia.org/wikipedia/commons/2/26/The_British_Empire.png) - and you'll see that most of the colonies were on the coast of a continent - very few were landlocked countries.

The British empire may have had more economic dominance than the USA - but I haven't the facts, and it's a close call either way. The USA currently accounts for a third of world economic output, whilst the British owned around a quarter of the world's resources - and many parts were underdeveloped, so it looks like the USA is stronger here than us Brits.

As for conference-diplomacy, the USA is a key player in many of the international organisations and has special relationships with many other powerful nations and institutions, most of these things didn't matter during the European/Asian empires in the way that they matter now.

Well, other nations will probably have them under development. Hell, some of the stealth aircraft in development come from Asian firms (Mitsubishi ATD-X, for example), and our very own BAE is involved in the development of them: but no other military has the budget to actually buy and maintain a fleet of them. Well, the EU probably could, but what would the point be? Russia and China have got to bring up the quality of their basic militia first, before worrying about expensive technologies such as stealth aircraft - maybe in a few decades.

Well, obviously, but no nation is currently anywhere near, and it would take decades for anyone to catch up, and that's if the USA stands still, which it won't. Point is: right now, it's impossible, what happens in the future is different, but I predict that the USA will resume its military dominance for at least the next 30 years without challenge - unless something really bad happens in the ways of international relations

come 10 years from now wars will be fought with machines...it just depends on which country has the most money/natural resources to their name.

Which would be the USA.