Tacos are an extremely popular food, but their origins are unclear. Many historians have a theory that tacos did not make an appearance in America until 1905, when migrant workers from Mexico began working on railroads and mines in America. In the years to come, as Mexican immigrants became acclimated to the food served in America, they began to incorporate American toppings into this traditionally Mexican dish. For example, they started including cheddar cheese and iceberg lettuce as taco toppings. In the 1940’s, Mexican chefs created the hard taco shell that is commonly used today, and in the 1960’s, Taco Bell was created. Tacos became a fast food staple soon afterwards.
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