"No country in history" is a pretty bold claim. Surely Britain ceding India for example would be a counterexample, just off the top of my head.
But honestly, uh, good? I don't want the US acting as global hegemon. The power and influence wielded by the nation-state only goes to benefitting the rich and powerful. It doesn't benefit ordinary people in any way, whether domestically or abroad.
I don't know why it's assumed that heading a global empire is supposed to be a good thing, it certainly doesn't align with my values as a leftist.