America's complicated, ever-changing relationship with its most recent residents.

MAP: What Does the U.S.-Mexico Border Really Look Like?

TIMELINE: Inside the Epic, Ongoing Battle over DACA

WATCH: A High School Activist from Richmond, on Stepping Up for Her Community

WATCH: This SF High School Student Started A Latino Marching Band to Fight for Immigrant Rights

The Twisted Roots of America’s Immigration System (with Lesson Plan)

'Sanctuary Cities' Explained

How 9/11 Changed America: Four Major Lasting Impacts (with Lesson Plan)

America's Complicated Visa System and How it Could Change Under Trump

Do Undocumented Immigrants Pay Taxes? (with Lesson Plan)