Colombia President Juan Manuel Santos is a world leader in trying to reform global drug policy. But when he spoke at the recent United Nations drug summit and tallied his supporters, the US delegation was nowhere to be seen.

Colombia’s renegotiated peace deal shows that the “war on drugs” will be hard to dismantle.

At the DNC

Mexican agricultural producers need to emerge from their “comfort zone” and begin looking for alternatives to the US as an export market

__ The presidents of Argentina, Brazil and Urugu...