can mimosa hostilis be grown in america? im sure not legally but i mean tropical climates such a Florida are able to grow most things would Mimosa be one of them?

Yes mimosa should do fine outdoors in a (sub)tropical climate. Also several people seem to be having success with growing it indoors in pots but it is a tree so make sure you've got the space for it if you decide to pursue that route.

def something im going to look into of course it takes years to grow a tree but when you cant get MHRB anymore anywhere you can just look in your own backyard =)

Theres a mimosa tree or trees over by my house but their the wrong ones, their the ones with the red flowers