Now that the voters in Colorado and Washington have approved marijuana legalization initiatives, attention has turned quickly to questions surrounding implementation—and in particular to speculation over how the federal government might react. This is entirely understandable, since it is no secret that the newly approved state initiatives conflict with federal law.

Voters in Colorado and Washington state who approved the recreational use of marijuana Tuesday sent a salvo from the ballot box that will ricochet around Latin America, a region that's faced decades of bloodshed from the U.S.-led war on drugs. Experts said the moves were likely to give momentum to countries such as Uruguay that are marching toward legalization, to undercut Mexican criminal gangs and to embolden those who demand greater debate about how to combat illegal substances.

Over the past year, the world has eyed Latin America as it has forged forward, in both policy and politics, with a rethink of the “war on drugs.” (See our recent cover story on “Latin America reinventing the war on drugs” here.) But tomorrow, the world will be watching the United States, the birthplace of the “war on drugs,” as three states vote on legalizing the recreational use of marijuana.