Those were great Americans, and the first Americans, with no loyalty to England or any other European cesspool, but only to their God and to each other.
They came over on one ship, while Columbus had a ship and two spares to make his journey far less dangerous. They set up a viable system of self-governance before even departing for America. They expected no help from any existing government, and they were right. Government never took interest in North America until American people thrived and created wealth, which attracts government as surely as chum attracts a shark.
"Indiginous People's Day?" Give me a break. The natives that the Mayflower pilgrims met were not "Americans." They could not have drawn you a map of the Continent, or even much of their immediate surroundings. They could not have guess how far the ocean went from their shores, they had never had the brains, courage and initiative to explore it.
We brought them healthcare, plentiful food, literature, and a constitution copied by one of the few tribes that tried to follow our example and better themselves.