It was, and still is, gringo or gabacho.

Eduardo De Gortari goes by Gabacho, and Johnny Bravo.

Then you are a gringo (American), gachupin (Spaniard), gabacho (French), or güerito (wher-ito) (foreigner of indeterminate origin).

In the US and Mexico, it means, "#%@/# white guys," the 'white guys' being US citizens. 'Gabacho' is a mildly pejorative term in both Spain and Mexico. In the different locations it refers to different groups, however, they both do tend to be light complected peoples. It's correctly spelled 'gabacho.'

Güero, if either he is Mexican or of unknown nationality. If he is American, he is usually called Gringo or Gabacho.