Who is in charge of upholding the supremacy clause of the united states constitution ?

I would say "The president of the USA" hope this works. since he is the main head.

The native americans, spanish, french and americans all name places in our state. the word “arkansas” came from the quapaw indians, by way of early french explorers. at the time of the early french exploration, a tribe of indians, the quapaws, lived west of the mississippi and north of the arkansas river.