Mexico is Unique among the tyrannies friendly to the United States. Not only does it share a porous, 2000-mile border with the United States, but it is probably more interdependent with the United States on a host of issues — water resources, pollution, energy supplies, tourism, investment, trade, finances, migrant labor, debt, drugs, agriculture, to say nothing of politics and diplomacy — than any other country in the world. What happens in Mexico has profound implications for the United States and viceversa.