the problem with the USA , is that it has not existed long enough as a cohesive ‘nation’, added to which it is perhaps too big to hold together as a nation.
Because the USA has been a construct of the surplus of the countries that make up Europe, who came to the USA to escape the privations of their homeland to discover an infinity of riches in the new world.
But those migrants brought with them all the idiosyncrasies of the disparates peoples that made them who they are.
to the newcomers the USA was a literal infinity of plenty. Material wealth had no end at the start of the 19th c. Or so it seemed.
So the incoming peoples just gorged themselves to excess.
Now that excess has gone, so those incoming peoples are reverting to the roots of European rivalyies and starting to fight over the scraps of what’s left