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President Barack Obama speaks at the Port of Tampa in Tampa, Fla., ,Friday, April 13, 2012, about trade with Latin America before heading to Colombia for the Summit of the Americas. (AP Photo/Chris O'Meara)

President Barack Obama speaks at the Port of Tampa in Tampa, Fla., ,Friday, April 13, 2012, about trade with Latin America before heading to Colombia for the Summit of the Americas. (AP Photo/Chris O'Meara)

Americas Summit

Unprecedented Latin American opposition to U.S. sanctions on Cuba left President Barack Obama isolated at a summit on Sunday, April 15, and illustrated Washington's declining influence in a region being aggressively courted by China.