In OTL, the Americas were settled mainly by France, England (Great Britain after 1707), Spain, and Portugal, with some minor colonization attempts by the Dutch, Danish, Russians, Hospitallers, Norwegians, Scottish (pre-Union), Swedish, and Courland.
It was only while doing a scenario positing a world where every major world power colonizes the Americas did I realize how implausible some colonies (like those of ancient Egypt, Greece, and Rome) would be, mainly due to the difficulty of getting there and just propping up a colony.
Which brings me to the question: what other polities (including non-American tribes) could have colonized the Americas?
For example: the most common non-OTL colonial powers I keep seeing in AH media include a sufficiently advanced Rome or Carthage, China, Japan, or the Polynesians.
It was only while doing a scenario positing a world where every major world power colonizes the Americas did I realize how implausible some colonies (like those of ancient Egypt, Greece, and Rome) would be, mainly due to the difficulty of getting there and just propping up a colony.
Which brings me to the question: what other polities (including non-American tribes) could have colonized the Americas?
For example: the most common non-OTL colonial powers I keep seeing in AH media include a sufficiently advanced Rome or Carthage, China, Japan, or the Polynesians.