Actually, you can take the "a storyline that American culture tries really hard to sell people on" bit a step farther-- it's not just that Hamilton is an American Dream narrative, it's also that Hamilton is a /broadway/ narrative. Broadway, specifically that street in New York City. And part of being a broadway musical is selling New York City, so of course Hamilton is the hero. He undeniably had a big part in making NYC what it was. That line in The Room Where it Happens, where he says "cuz we've got the banks" is pretty much the climax of the whole musical for me.

Broadway musicals are a big tourist attraction, so the push to glorify NYC is not a coincidence at all. It's something the target audience (tourists) are already interested in, and it drives them to spend more money and come back more often. There's a reason so many of those musicals are set in / about their home city and it's that same reason that Hamilton is the hero. Not just a narrative about coming to the USA-- it's about coming to NYC specifically. Aren't we the best city? Aren't we glorious? Here's our song and dance!

(Hi, came for the Imperial Radch thoughts, stayed for the 'finally someone who agrees with me that Burr Fandom should be the thing'.)