How I prove I'm Cherokee?

My family seems to think that we are Cherokee Indian (a lot of people in my family had dark skin). So I won't be like those celebrities who claim Native American ancestry without having any proof (Elizabeth Warren, Chuck Norris, etc.), how can I find out for sure if I'm part cherokee? How can I find out if... show more My family seems to think that we are Cherokee Indian (a lot of people in my family had dark skin). So I won't be like those celebrities who claim Native American ancestry without having any proof (Elizabeth Warren, Chuck Norris, etc.), how can I find out for sure if I'm part cherokee? How can I find out if one of my ancestors was a member of a tribe? I honestly don't really care, but I guess I just want to do this as a project for the summer.
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