It was a story I read while in high school about a caucasian man who is the subject of reverse racism. I think he was in mexico, and something happened where cauasians became the minority. I'm not entirely sure about the plot, but I'm pretty sure about the racism part of it.
Any help would be appreciated.

Sounds like, "And the Rock Cried Out". It's collected in the new Bradbury anthology:

BRADBURY STORIES: 100 OF BRADBURY'S MOST CELEBRATED TALES. Ray Bradbury. HarperCollins, NY. 2003.

Great! I think that's the one I'm looking for. Here's a synopsis I found for anyone interested in the story.

"And the Rock Cried Out," follows two wealthy travelers in Africa who discover they're the last white people on earth. Their punishment for the West's constant imperialism is the loss of all worldly possessions and a life devoted to menial labor.

They're definitely not in Africa. As I remember the story, it's set in Mexico.

It's Mexico or South America, and they're not the last white people left on earth, they're the last North Americans left in that area.