The Inuit’s predecessors were proven to be something other than their own ancestors by discoveries at Independence Fjord, in the far northeast corner of Greenland at more than 80°N. The Inuit are known to have migrated into the area sometime around 1300 AD, but the Tunit had been there long before.
Like other native Americans, the Tunit originated in northeast Asia, though they crossed to the Americas long after the two previous bursts of colonization that had filled the continents from Tierra del Fuego to the tree line of Hudson Bay and the Northwest Territories. The high latitude parts of North America were uninhabitable without the right technology, and it was people on the Siberian coast of the Chukchi Sea who first developed it about 3000 BC. Among several other innovations they had the bow and arrow—which didn’t arrive in northeast Asia until after the previous sets of people to colonize the Americas had already left. There’s actually a distinct chance that it was the proto-Tunit who introduced the bow to all other people in the Americas.