Where were corn tortillas first invented?

Answer 1

Not an exact answer, but this from Wikipedia;

In Mexico and Central America, a tortilla is a type of thin, unleavened flat bread, made from finely ground maize (often called "corn" in the United States). In Mexico, there are three colors of maize dough for making tortillas: white maize, yellow maize and blue maize.

A similar bread from South America is called arepa (though arepas are typically much thicker than tortillas). This form of bread predates the arrival of Europeans to America, and was called "tortilla" by the Spanish from its resemblance to the traditional Spanish round unleavened cakes and omelets (originally made without potatoes which are native to South America). The Aztecs and other Nahuatl-speakers called their tortillas by the name "tlaxcalli"; these have become the prototypical tortillas.

Answer 2

In Mexico, although this includes territory that has since been taken by the United States.