Is American nationalism a genuine threat to non Americans? Yes, but not it the sense Moussa and most folks generally consider. Rather, it is a threat because it defends a social system that succeeds, that attracts millions of people to abandon being "non-Americans" and become Americans.
Give us enough time, and the post-9/11 sentiment "we are all Americans" won't be simply sympathetic rhetoric, but reality.
We didn't merely dream up the Borg for Star Trek, we
are the Borg. Resistance is futile, you will be assimilated, one Big Mac and Coke at a time.
Does American nationalism even exist in the way Amr Moussa describes? Not in any meaningful sense, if it did, then Arab nationalism and Islamism would be as signficant on the world scene today as Indian (Native American) nationalism. Amr Moussa can yak his fiction all he wants, but woe unto him when our children start playing Cowboys and Arabs...
What is the eventual cause of the antipathy towards America if not for this perception of American nationalism?European antipathy is primarily rooted in socialism vs. capitalism, European elitism vs. the "vulgar Americans" (remember, it was mostly European working class folks who emigrated, leaving their "betters" behind in Europe), and the aggressively anti-spiritual aspect of European intellectualism. Arab anti-Americanism is rooted in Islam and their massive inferiority complex.
Above all else though, it is envy and fear of America's success that is the root of the antipathy.
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Now, the perception that America is the greatest threat to world stability is both accurate, and woefully mistaken. It is accurate in the sense that, being the world's only hyperpower, America has the unique ability to wreak havoc throughout the world on a scale never before witnessed. This is a simple, stark fact, and it scares the bajeezus out of a lot of people. If the United States decided to, we could economically, culturally, or militarily destroy any country or peoples in the world, and the vast majority of them couldn't do anything meaningful against us. For many folks, they look at the enormous power the US has, and then subconsciously consider "how would my country behave with that sort of power"? Historically, non-American nationalism would likely have inflicted millions of deaths in the Islamic world since 9/11. Such power makes folks nervous, and nervous people become hostile.
Another aspect of this is the fact that the US is foundation of global stability. The lynchpin of the world economy is the US economy. World trade flows over the seas under the protective umbrella of the US Navy, the world financial system trades primarily in dollars, etc. The selection of no other nation's leaders matters nearly as much to the rest of the world, nor attracts as much attention from the world's media.
However, its woefuly mistaken because, except perhaps for Japan, no nation in the world has as great a stake in global stability as the United States, both from the pragmatic and ideological standpoint. Its woefully mistaken because everytime there's a natural disaster, or a need for peacekeepers, or some other crisis, its almost automatic to call for American aid.
What happens to global stability if American nationalism takes an isolationist turn?