Sea travel along the coast spreads people much faster and further. Early Americans came from the Europe after the last ice age by boat, following the edge of the ice sheet across the Atlantic. The spear points were supposed to be a Old World thing only. Clovis points are the first distinctly North American projectile point for spears. Personally, I believe in the first two for now, and the 3rd one would really throw a wrench into the works, but it wouldn't be beyond belief.
Humans travel and get everywhere by every means.
Usually there isn't just one answer and colonization usually happens in fits and starts, with a wave of people coming later. Early colonization attempts may have happened but not succeeded. One can suspect that Clovis culture was the first wave of really successful settlement of the Americas. So, now onto the Archeology of Alberta. The oldest known site is at Vermillion Lakes near Banff at some 10400 years.