I see it as a domino affect. If there had been no Spanish-American War then there were have been no Pacific "colonies" and if we had not annexed the Hawaiian Islands there would have been no US territories for Japan to attack.
And I think if we had not gotten involved in WWI there would have been no WWII, no nazi Germany, no Holocaust.
Why should the US have cared whether Kuwait became the 19th province of Iraq or not? All those Middle East boundaries were artificial creations made by the UK and France.
I don't think the US should either be the policeman or the social worker of the world.