(September 18, 2009)--Two iconic eateries along the U.S.-Mexico border have closed their doors, both victims of a slump in tourism.

Caesar's in Tijuana, which popularized the Caesar salad, closed as one victim of a tourism-dependent economy devastated by crime, drug violence and the swine flu.

Tijuana is across the border from San Diego, Calif.

The slump in visitors from the U.S. also appeared to have claimed an eatery linked to the invention of nachos in the town of Piedras Negras, across the Rio Grande from Texas.

The Restaurant Moderno in Piedras Negras, across from Eagle Pass confirmed the reputed birthplace of the nacho closed this summer.

A waiter at the Moderno, Ignacio Anaya, was credited with inventing the corn chip, cheese and jalapeno dish.

The name came from Anaya's nickname, "Nacho."

The employee gave no reason for the shutdown, but local media quoted another employee as saying the closure in June was caused by a drop-off in business because of crime and the swine flu.