They don't need U.S. approval to make changes or, in the case of Mexico, to maintain the status quo. Most Latin countries opposed the U.S. war in Kosovo, probably because they feared they might be the next to have U.S. peacekeepers. Indeed, they rejected subsequent U.S. efforts to strengthen OAS mechanisms to ensure the protection of democracy in the hemisphere. If the United States begins acting against Latin American countries, without OAS support, it will be a public relations disaster. Toppling dictators would be bad enough, but the United States has no business trying to determine whether the democratically elected president of Venezuela has violated his own country's constitution.
Democracy works here, and they want people elsewhere to enjoy the benefits.
But democracy doesn't necessarily work everywhere and, even if it did, the United States has no legal authority to impose it outside U.S. borders. Enter words describing a concept or keywords.