1520 -Bernal Diaz del Castillo (1496-1584), a Spanish soldier who came with Hernán Cortés to the New World, wrote an intriguing and detailed chronicles called A True History of the Conquest of New Spain. He also chronicled the lavish feasts that were held. From the article by Sophie Avernin called Tackling the taco: A guide to the art of taco eating:

The first “taco bash” in the history of New Spain was documented by none other than Bernal Diaz del Castillo. Hernan Cortes organized this memorable banquet in Coyoacan for his captains, with pigs brought all the way from Cuba. It would, however, be a mistake to think that Cortes invented the taco, since anthropologists have discovered evidence that inhabitants of the lake region of the Valley of Mexico ate tacos filled with small fish, such as acosiles and charales. The fish were replaced by small live insects and ants in the states of Morelos and Guerrero, while locusts and snails were favorite fillings in Puebla and Oaxaca.

1914 - The first-known English-language taco recipes appeared in California cookbooks beginning in 1914. Bertha Haffner-Ginger, in her cookbook California Mexican-Spanish Cook Book said tacos were:

"made by putting chopped cooked beef and chili sauce in a tortilla made of meal and flour; folded, edges sealed together with egg; fried in deep fat, chile sauce served over it."

1929 - Pauline Wiley-Kleemann  in here cookbook  Ramona's Spanish-Mexican Cookery, featured six taco and tacquito recipes. These included recipes for Gorditos that came from Santa Nita or Xochimilco, Pork Tacos composed of snout, ears, jowls, kidneys, and liver, Cream Cheese Tacos, Egg Tacos, Mexican Tacos, and Tacquitos

Taqueria or taco trucks are found throught the West and Southwest of the United States. There are two kinds of taco trucks; traveling trucks that cruise around neighborhoods and business areas, and non-cruising trucks parked permanently in lots.