Wondering Who Was The First Native?

The La Conner Tribe happens to be the oldest community in Skagit County. It was first settled by non natives after the Civil War took place,so I'm guessing that soon the non native settlers brought over the natives, or maybe there was a American half native. There had to be someone native or at least American and native to settler there first for the tribe to be known as a native tribe. Then again there could of been great oppurtunity in the community that attracted the natives to go there,like jobs,better farming or something that was of value to the natives.