Coming back to the U.S. from Canada U.S. Customs and Border Protection http://www.cbp.gov/travel/us-citizens/canada-mexico-travel Coming back to the U.S. from Canada U.S. Customs and Border Protection http://www.cbp.gov/travel/us-citizens/canada-mexico-travel U.S. Customs and Border Protection U.S. Customs and Border Protection Canada and Mexico Travel U.S. Customs and Border Protection: Canada and Mexico Travel traveling to Mexico Coming back to the U.S. from Canada U.S. Customs and Border Protection https://www.cbp.gov/travel/us-citizens/canada-mexico-travel http://www.cbp.gov/travel/us-citizens/canada-mexico-travel U.S. Customs and Border Protection U.S. Customs and Border Protection U.S. Customs and Border Protection cbp.gov US Customs & Border Protection: Travel to Canada & Mexico across the Mexican border U.S. Customs and Border Protection U.S. Customs and Border Protection