There is almost nothing now that holds America coherent as a country. It has too much variance to form a sensible cluster. It went from a basically almost racially homogeneous, English speaking, Christian - with a lot of flavours I recognise but still - and ideologically united country to a multi racial, multi confessional, and now in some part multilingual with radically opposing views and interests country.
There is more in common on many points between Estonia and Ireland than between California and Arkansas.
Trumpism was not an outlier but an indication of how strong the centrifugal forces became...