I tend to refer to them as Indigenous People, but then again, I tend to refer to myself as Native American because neither I nor a great number of my ancestors over the past few centuries have been native of anywhere else.
However, there are a lot of people that disagree with me there. It's not like I am ever going to try and figure out if that makes a difference though, because ethnic segregation is not much use to me. I am willing to give anyone a shot at getting somewhere else, and I will try to understand and enjoy their culture, unless they make that so undesirable or impossible it just won't work out.