Customs and Border Protection (CBP) IS the single unified border agency of the United States of America.
Here’s how we can help:

• Customs FAQS & Contact form
• Global Entry
• About I-94 or I-94W Green or White entry cards
• To register with ESTA go to https://esta.cbp.dhs.gov/esta/
• Transportation Letters for Legal Permanent Residents: see Lost & Stolen Green Cards

Bureaus within DHS

• Transportation Security Administration (TSA)
  Protects the Nation’s transportation systems to ensure freedom of movement for people and commerce
• U.S. Citizenship and Immigration Service (USCIS)
  Responsible for the administration of immigration and naturalization adjudication functions and publishing immigration service polices and priorities.
• U.S. Immigration and Customs Enforcement (ICE)
  Responsible for identifying and shutting down vulnerabilities in the nation’s border, economic, transportation and infrastructure security.
• U.S. Secret Service (USSS)
  The Secret Service protects the President and Vice President, their families, heads of state, and other designated individuals; investigates threats against these protectees; protects the White House, Vice President’s Residence, Foreign Missions, and other buildings within Washington, D.C.; and plans and implements security designs for designated National Special Security Events.