There are places where it happens in America, its just very hard to do that in such a large country without leaders that want to make it happen. Its much more profitable for politicians to have a population that doesn't want to work together and keeps fighting each other for transgender rights when they can't make ends meet and are one step away from being homeless.
I think the last chance we had for a politician that was somewhat visionary was with the first Obama term but he was too entrenched in the politics to actually drive any real change, with all that bipartisanship bullshit. Now they will just continue to invest in driving a wedge between the population to prevent them from noticing they're in a class war.
Another way to look at it is through the lens of nationalism. Other countries, which have formed around nations (which are groups of people with a collective identity), have an inherent need to care for "their" people. Slovakia is 83.8% Slovak. Portugal is 87.8% Portuguese. Poland is 98.8% Polish. [*]
America is a country of immigrants. Apart from the brutally oppressed indigenous population, everyone is from somewhere else. Hence the Americans' obsession with heritage (the Italian-Americans, the Irish-Americans, the Black Americans, etc.), and even grouping as blocs based on their ancestry - it is because they don't see themselves as being an American nation?
[*] This can be a problem in its own right, e.g. the ethnic cleansing of the Bosnians by Serbians, the players in the Balkan war each wanted "their" people on "their" side of the border, and murdered or displaced others to make it so. Also, to be fair, a number of European countries no longer collect nationality/ethnicity, including the Swiss, possibly because they don't want such maps to exist for any future nationalists to make use of.
Not sure, there have been moments of unity in the country, but you need someone inspiring to make that happen or a common enemy everyone can rally against, like what is happening in Canada right now. We're missing this inspiring factor, nations are mostly a made up construct, you can definitely build it one way or another.
I think the last chance we had for a politician that was somewhat visionary was with the first Obama term but he was too entrenched in the politics to actually drive any real change, with all that bipartisanship bullshit. Now they will just continue to invest in driving a wedge between the population to prevent them from noticing they're in a class war.