Your beginning time frame was 1620. You referred to immigrant groups who “built the country”. The country was already built by over two hundred years by the 1860s.
The Naturalization Act of 1790 limited citizenship to white people only.
The point of discussion was WHO built the country, not immigrants groups who came to an already established nation.
Really? When did Alaska become a state? When were the railroads to the west completed? When was Oklahoma populated?