What is the theme in Rain of Gold by Victor Villasenor?

Racial equality is a theme in this story.

The two families followed in the story are motivated by the need and continually struggle for equality with the more wealthy and educated. While in Mexico, the poor people are given very little opportunity to better themselves, and are treated as undesirables by the upper classes. The Revolution begins when people are locked out of their capital city so that the president can entertain influential foreigners, and the masses rise up against this authority.