United States: engagement or non-intervensionism?

[DS-09]

Should the United States keep its post-war role as the upkeeper of the world order, and will this be of benefit to the world? Or would it be better for the United States to withdraw militarily from the world and return to its pre-war non-interventionist foreign policy (similar to Britain's splendid isolation), considering that large nations such as Russia are re-asserting themselves on the world stage (also considering Russia has a nuclear arsenal of anywhere between 5,000-14,000 active weapons)
Also what about Taiwan? What if China invades this island and the United States provides a war guarantee (similar to Britain's guarantee to Belgium before World War I) - this would mean that among two of the most powerful nations on earth could face a nuclear collision over the issue (more frightening would be a Sino-Russian pact). Should America withdraw its troops from the world, and avoid the faith of other powers in times past? Should America return to the foreign policy of its founding fathers, and that which the nation followed throughout the 19th century- or should the United States stick it out in world affairs, even if there are dangers from China and Russia.
So what do you think? Interventionist or non-interventionist United States. It will also be interesting to see how things unfold under the new administration if Washington. Another interesting thought is, would such a scenario effect globalisation and world trade? Btw whatever your views, please be reasonable about them. Thanks.

http://en.wikipedia.org/wiki/List_of...uclear_weapons

http://en.wikipedia.org/wiki/United_...nterventionism

[ame="http://www.amazon.com/Americas-Coming-War-China-Collision/dp/1403968411"]Amazon.com: America's Coming War with China: A Collision Course over Taiwan: Ted Galen Carpenter: Books[/ame]

http://www.timesonline.co.uk/tol/new...icle420364.ece

[Demotruk]

Whatever position would be good or bad, I don't think they'll actually have a choice about it any more, they're just too broke.

[smitchy2]

They will hold up their positions around the world to defend their geographically assets.
If they pull out China will fill the gaps.

[DS-09]

Fair point. Also it would be interesting to see whether China turns in on itself again and withdraws from the world (as in centuries past). A lot of people think that the threat of a total war involving nuclear weapons ended with the Cold war- they could be eerily wrong. Also Russia seems to be re-asserting itself, and even getting confrontational in Central Asia in regards to the Caucus pipeline, and is growing hot-tempered over the accession of nations bordering Russia been admitted into NATO