If you have compassion for all of the Mexicans who try to get to America just to improve themselves and their families, you should read the new book by Charles Bowden called Exodus.
The first words in the book are, "I want to thank all the Mexicans who taught me the pain of leaving home and the struggle required to find a new home."
Having lived abroad for many years this hit home.
This is a glossy coffee table book which has a lot of nice pictures, but also excellent text. I recommend it highly.