The facts
The U.S.-Mexico border runs nearly 2,000 miles; border security combines physical barriers, technology, personnel, and policy at ports of entry and between them.
Border enforcement is funded by Congress and carried out mainly by Customs and Border Protection, with policies that shift across administrations.
Most analysts distinguish border security from the broader immigration system — asylum rules, visas, and the status of people already in the country — though the debates are often merged.
Understand the issue
Civics quick read
Glossary
Border Security
It's the mix of walls, cameras, agents and rules used to manage who and what crosses the border.
Glossary
Customs And Border Protection
CBP is the agency whose officers and agents work at and between U.S. border crossings.
Civics
How does U.S. border security actually work?
A plain-English look at who guards the U.S.-Mexico border, what tools they use, and why the politics get tangled with broader immigration debates.
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Should we secure our border?
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