Why does the United States want to thank the Indians?

Because there were too many massacres, too many native North Americans were killed.

At least tens of millions.

Reference: Trail of Tears

The behavior of the United States was the same as that of the Spanish in South America. From Columbus until the United States developed the West, Indians in the Americas died, were trafficked, and died of plague. The numbers were absolute. There are more people than there are in the United States now.

So, Columbus is a scumbag, I totally agree.

The Americans thanked the Indians and said with a smile: Idiot, thank you for your land.

The United States even once legislated that if an Indian was killed, his skull could be sold for 3 to 10 dollars.