Jason de Leon has spent years studying undocumented migration and border concerns, trying to understand why people would leave their homes in search of new ones. The reasons can include climate change, poverty and violence, and in his newest book, Leon dives into clandestine border crossings like never before. Dana Jacobson has more.

"CBS Saturday Morning" co-hosts Jeff Glor, Michelle Miller and Dana Jacobson deliver two hours of original reporting and breaking news, as well as profiles of leading figures in culture and the arts. Watch "CBS Saturday Morning" at 7 a.m. ET on CBS and 8 a.m. ET on the CBS News app.

Subscribe to "CBS Mornings" on YouTube:    / cbsmornings  
Watch CBS News 24/7: https://cbsnews.com/live/
Download the CBS News app: https://cbsnews.com/mobile/
Follow "CBS Mornings" on Instagram:   / cbsmornings  
Like "CBS Mornings" on Facebook:   / cbsmornings  
Follow "CBS Mornings" on Twitter:   / cbsmornings  
Subscribe to our newsletter: https://cbsnews.com/newsletters/
Try Paramount+ free: https://paramountplus.com/?ftag=PPM-0...

For video licensing inquiries, contact: [email protected]