Massacres, the slave trade, and the theft of vast tracts of other people’s land, have all been justified by claims of religious, cultural and racial superiority. Such myths often hide the harsh reality of exploitation and colonization. Facts are if the US had been able to implement anti immigration laws beginning in 1776: Those from German, Irish, Scottish, Eastern Europe, Catholic, Jews, Asia, Italian ancestors would not be citizens today.
Just think of all the former anti-immigration movements had took hold, this country would still belong to Indigenous people, including Mexicans.

Few of their children in the country learn English … The signs in our streets have inscriptions in both languages … Unless the stream of their importation could be turned they will soon so outnumber us that all the advantages we have will not be able to preserve our language, and even our government will become precarious.
-Benjamin Franklin, Founding Father, on German immigration to Pennsylvania, 1750s

We should build a wall of brass around the country.
- John Jay, first chief justice of Supreme Court, regarding “Catholic alien invaders,” 1750s

What means the paying of the passage and emptying out upon our shores such floods of pauper emigrants — the contents of the poor house and the sweepings of the streets? — multiplying tumults and violence, filling our prisons, and crowding our poor-houses, and quadrupling our taxation, and sending annually accumulating thousands to the poll to lay their inexperienced hand upon the helm of our power?
- Lyman Beecher, Leader of the Second Great Awakening, on English immigrants, 1834

Standing behind them are Christian employers of this land, who would rather import heathen willing to work for barely enough to sustain life than retain a brother Christian at a wage sufficient to live as becomes a Christian. We do not want Opium or the Chinese who grow it.
- Terence Powderly, Irish-American labor leader, 1892

After all we built up this country and then we allow a lot of foreigners, the scum of Europe, the offscourings of Polish ghettos to come and run it for us.
– John Dos Passos, early 20th century novelist, on U.S. immigration policy

If there were in existence a ship that could hold three million human beings, then three million Jews of Poland would board to escape to America.
-Congressional hearing, 1920

It’s a bit of a tautology, don’t you think?

Individuals arguing against continued, unfettered, third world immigration will lose the debate because the people in charge will continue to ignore their legitimate questions and increase the scale of unfettered, mass immigration.