First Nations is current usage for the tribes.
Tribes is not the right word for there were many forms of political organization, which united many nations.
The Algonquin Federation, six nations, which Ben Franklin had their Constitution translated, and used in his draft. The Five Civilized Nations of the Southeast.
Mayan was a trade language used by many who spoke another at home. The same for Spanish, Hispanic means Spanish speaker, but I met many who also spoke an older language at home, in their town, and English on the Internet.
Both the Aztec and Inca had cities larger than Europe.
The Mound Builders reached from the Ohio Valley into Mexico, with a vast trade network 3,000 years ago.
The conquest of the new world was mosty by Small Pox. Columbus landed once and is credited with killing 25 million.
500 years before Lief Ericson the Numidians came, fleeing the Romans in the days of Claudius.
200 years before Columbus the Mandan came from Wales, fleeing the Normand Conquest, brown hair, light eyes, Welsh speaking when the Americans came and killed them.
Copper for the European Bronze Age came from the Great Lakes.
Neolithic graves have Jade from the Americas, and Egyptian mummies were enbaumed with tobacco and cocain.
According to Plato, Atlantis had an empire larger than Asia and Africa combined on the other side of the ocean named for them. Only they had the secret of Oracalium, which was a metal, Ora=gold, Calium=copper. Brass, bronze. Copper from the Great Lakes, Tin from Wales, the Welsh have a lot of First Nation genes.
Going way back, 15,000 years, Norwegians and Ojibewa, Souix, share a genetic line.
A historically correct name would be Atlantis, and Atlantians.