"Mexicans are like descended from the real Americans so it's their land in the first place "


You mean like the Jews, that were driven out of ancient Israel, moved through Spain, England, Germany, and Poland, and then returned to Israel?


They are as much descended from the "Real Israelis" as the Mexicans are of the indians who lived here before the Europeans- though they drove out earlier tribes.

Just askk the Terra del Fuagans ( pardon spelling), or the tribes that used to be where the later tribes settled.