The 100th anniversary of Pancho Villa's invasion of the U.S. raises the question of why he did it.

Republican presidential candidate Donald Trump has called for a large border wall. We look at the damage a wall would create for the surrounding ecology.

How the nearness of the Mexican border influenced formerly enslaved people in the state of Texas.

What was the inspiration behind Friday Kahlo's iconic garden?

As President Obama prepares to move forward on immigration reform, the debate over the role of immigrants in US society is ramping up.