Many things..going as far back as ancient times. Here is a quote from our great President Barack Obama as he toasted Mexico's President Felipe Calderón at a White House dinner:
"We celebrate all that Mexico and its ancient civilizations has given the world throughout history -- advances in architecture and astronomy, mathematics and medicine, and of course, some very good food -- including the "food of the gods" -- chocolate" (Laughter.)
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Pancho Villa
The Mayans introduced the concept of zero to mathematics and an astronomical calendar. Much of modern Mexican cuisine is Aztec, including the use of chilis and cocoa. They also domesticated the turkey.
Mexican-American men were eligible to enlist or be drafted into the US military, and thousands were, where they served at least as well as any other ethnic group. Women found new opportunities for employment beyond agricultural labor, in the rapidly expanding defense industry. The US began a "bracero" ("strong arms") program to encourage Mexican nationals to come to the US as guest agricultural workers.
The 1810 Mexican war was a fight for Mexican independence from Spain. The 1910 was a revolution or struggle between the Mexican government and the Mexican people.
The Mexican cession was the outcome of the Mexican American war.