O.K., here comes the demagoguery. It should have been obvious to you, that I was addressing the origin of the group that came to define American at the time of the Revolution. Those whom you call "Native Americans"--an insult to the Indians, because they had their own very distinct ethnicities (plural) at the same time, and American is a European word coined to refer to the original white settlers--in many cases fought with great bravery and suffering to preserve their ways and values from the encroaching "American" development. That they lost is no reason to deny them their actual identities (again plural).
With regard to the Negroes, present largely in the South, they did indeed contribute a great deal to the developing Southern culture of the times and those immediately subsequent; and to this day are a part of that culture. But it is not accurate to suggest that they were really considered a part of the American ethnicity at the time. Whether you like it or not, they were not, both because of the racial aspect, and the fact that initially most of them were in bondage. But certainly, their interest today is one as the hand, to use Booker T. Washington's metaphor, with their White neighbors, over this question of immigration. They are the immediate victims of open borders; the jobs being taken, taken primarily from the least skilled (and least able to defend themselves) class of their race.
The Spanish were not found in any significant numbers in the original 13 States. There was an old Spanish culture in Florida, which was acquired in 1819; and which like those of the Indians, must be considered a rival ethnicity prior to that acquisition. Having never been to Florida, I do not know if it has survived to this day, or in what form--as opposed to the new Cuban-American group in South Florida--but they are not one group. While we respect both, they are distinct in their historic development, as would be other Spanish language ethnic groups, encountered with the annexation of Texas and in the Mexican War and its aftermath.
There are also old minority groups from Northern Europe, that have maintained a certain ethnic separation, such as the Amish.
No one is demeaning any of these people. But none of these other ethnic groups, to which you refer, or the broader spectrum to which I refer, had a hand in setting up the entity known as the United States of America, from a compact of the 13 sovereignties, recognized in the Treaty of Paris, which we call the Constitution. That Constitution reflects the values discussed in the Declaration of Independence; and those values--and the unique slant on them--reflect the experiences of those whom I described earlier.
William Flax