How long have humans walked earth particularly north America

Now our understanding of when people reached the Americas—and where they came from—is expanding dramatically. The emerging picture suggests that humans may have arrived in North America at least 20,000 years ago—some 5,000 years earlier than has been commonly believed.

Hope this helped :)

i believe we're not a republic so that is a hard question

legal rights and freedom of speech.i hope that it is correct.

brainliest if correct