Mexico has one of the greatest traditions of agrarian historiography in the world. Although we can always find more to do, especially given the great geographic diversity of Mexico, dozens and dozens of very intelligent and hardworking people have spent more than a century studying land, water, law, and politics in Mexico. I am not sure how many Mexicans understand how unusual this is. Probably we know more about these questions in Mexico than we do in most parts of the world, because in Mexico this kind of agrarian history is not some backwater only explored by agronomists and geographers. It is considered central to the country’s history.