Have UFOs appeared over Mexico?

Yes, unidentified flying objects have been reported over Mexico.

In fact, UFO sightings tend to be by people in the United States of America, Latin America or Europe. In terms of Latin America, one famous incident took place in Mexico. Specifically, it was in August 1953, about an hour's drive from Mexico City, around Ciudad Valle. A taxi-cab driver, Salvador Villanueva, reported meeting two space aliens and seeing their spacecraft around 6 p.m. in the evening, after his cab broke down. The description of the space aliens fit that of the "Grays" or "Greys," who tend to be short with slender bodies, large heads, and insignificant facial features other than big, dark, staring eyes.