Many will hate to hear this but the only solution is one world government or at least a unipolar order that reduces the survival need to participate in arms races. Arms race dynamics between nations will be the end of our species.
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That being said the only way I could imagine we'd get a single world order is one country dominating everyone else, just like superpowers and regional powers dominate their respective parts of the globe.
Never ever ever are people just going to give up their control out of some form of "enlightenment" that has never existed among the human race.
and yes, America has done that for the "pax Americana" period. unfortunately we were short-sighted and allowed people too much free reign to be stupid and anti-American.