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President Barack Obama sits in front of a large video screen displaying an image of a U.S. national flag at the CEO Summit of the Americas, in Cartagena, Colombia, Saturday April 14, 2012. Regional business leaders are meeting parallel to the sixth Summit of the Americas which brings together presidents and prime ministers from Canada, the Caribbean, Latin America and the U.S. (AP Photo/Carolyn Kaster)

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.