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I know that this is meant to be a silly post, but I've been OBSESSED with this concept since I first read the chapter, so-
Romano living with America makes sense. Italy, specifically South italy, had the highest amount of immigration to the US of all the European countries at that time and became very influential on American society later on. They were also "birds of passage". Every European that immigrated to the US had the intention of returning home one day, but the Italians are the only ones that succeeded at that en masse. Half of the 4-5 million that immigrated would return to Italy, some going back and forth for years. This let US Italians maintain a very strong connection with their home country, so it makes sense why Romano would follow them to the US. He's just another bird of passage who isn't actually "immigrating", just away from home for work for a bit. If Romano was the only one to go live with America, I wouldn't question it.
But Lithuania being there is weird. It's hard to track Lithuanian immigrants because they were counted as Russians beneath the Russian Empire until the 1900s. But it's believed that about 20% of the population of Lithuania fled to the US, particularly Jews. Which, while that isn't insignificant....that threshold is VERY low. You're telling me it only takes 20% of a nation's population to compel them to do something drastic? What about the 80% you left behind, Toris!! Further, the Lithuanian diaspora was no where near as big or as influential as the Italian, so what I'm saying is Lithuania should not be there only to decide to just, return home, someday, I guess? But he is, which implies that it only takes about a fourth of a population immigrating somewhere to make the nation follow. America is going to have a LOT of roommates under this model.
All in all, I headcanon that none of them really HAD to immigrate to the US. In true hetalia fashion, I like to think all of them just got bored/curious and wanted to leave home for a while and see what America was up to.
It's hard to put them in chronological order, but from 1840-1914, here's all the countries that I think would've lived with America in the NE, both working for him or just passing through:
Ireland, Various German States (Prussia? 🤨), Norway, Sweden, Denmark, Romania, Russia, Austria, Poland, Lithuania, Hungary, Greece, Slovakia, Czech, Ukraine, Finland
China would've been there too, but ONLY at America's house out West. And he would've hated working for someone the age equivalent of a 2-year-old to him.
So- if Romano and Lithuania ended up living with America when a large number of their people immigrated to the U.S.... wouldn't that mean that most of the other nations have lived with America at some point?
Did Germany and China both live with him during the California Gold Rush?
Did Russia live with him after the Cold War?
And just how many nations were living with him after WWII and the Korea War when war brides were coming back to live in the States?
I'm just imagining America's house as the nation equivalent of a Denny's at 3 am. Everyone ends up there, usually because something went horribly wrong, and if they're very lucky breakfast will be edible.