I’ll start:
Idaho - when people think “racism in the United States” their minds go to the Deep South. The Deep South is absolutely pretty bad, and there’s of course the whole history with the confederacy so it makes sense that’s what we think of, but Idaho is let off the hook way too much given that it’s a hotbed of Nazis and Christian nationalists trying to form a white ethnostate. Idaho needs to be more closely linked to virulent racism like the Deep South currently is. And tbh I’ve been to the Deep South, I like it down there, it’s actually pretty diverse in many areas, if I had to live there it wouldn’t be the worst thing in the world. You couldn’t pay me to set foot in Idaho.
Gen X - look, if we’re gonna do generational warfare gen x needs a lot more hate. Sorry to any xers out there but boomers have been punching bags for a while, millenials are starting to get a good amount of hate, and they’ve always been made fun of for their Harry Potter and office love, tbh a lot of millennial shit is just considered cringe these days, gen z obviously gets all the “ugh what’s wrong with the youth” hate and this new media cycle has them being portrayed as pretty much the new hitler youth. Gen x needs to start getting some more hate, especially now with all these weird gen x venture capitalists influencing the trump admin trying to realize their vision of a neo fascist network state
My armchair analysis is that it’s a common theme in futuristic space media to show that the Earth is much more united now that there are other worlds with which to fight, form tenuous alliances, etc. China is the biggest, most distant Other, so merging them into the American melting pot in your lore is the strongest way to make that point.
If two political bodies that were once very distinct in the past are now just provinces in a single nation, the cheapest way to extend that pattern into the future is to do what they did. It’s a bit cliché but I wouldn’t consider it the worst writing sin in the world if they had just made the characters and casting reflect that.
Side note: across Firefly and Dollhouse, there aren’t that many black characters either, and a uncomfortably large proportion of them are villains.