The divide is a feature, not a bug. There’s a reason the US is called an experiment, with all the trials, tribulations, failures and successes that come with that. “We do things not because they are easy, but because they are hard.”
Portraying the largest conquest and ethnic cleansing of the Americas as a deliberate experiment to figure out multiculturalism leaves a bitter taste, I'm not gonna lie.
And if you gave me a choice between a world divided in small Denmarks or between the contemporary re-armament of the west due to the election of a populist buffoon combined with decades of mismanagement of a unipolar world, I wouldn't think twice.
Every culture has sins and skeletons. That’s not to absolve them but if we’re comparing contemporary national cultures, their stability and demographic makeup, it’s obviously a spectrum of stability, progress, etc.