Based on the Solutrean hypothesis (which is wrong) but could a european population cross the atlantic? Starting point would be the area of modern Spain, they arrive in the area of modern South Carolina and then start to spread over all of America, parts of north america would already be populated by amerindians, the cro-magnoid people move towards South alongside the coast and the carribean islands until they reach South America, where they settle the whole continent. The North American population isnt as prosperous, it was already populated by amerindians, and Later even more people coming from the bering strait arrive and replace them in North America. South America, Mexico and southernmost North America however are still populated by the descendants of the cro-magnoid people, obviously however they arent really "white" anymore, being much darker due to living so close to the Equator.
Is this possible or not ? According to the Solutrean Hypothesis these peope would use icebergs for freshwater, catching fish and seals.