Empire building isn't for sissies. Just ask the Spanish conquistadors of the 16th century. Before attacking Indian settlements, they were required to read a summons called the Requerimiento, which spelled out the consequences of resistance: "I assure you that, with the help of God, I will attack you mightily. I will make war against you everywhere and in every way ... I will take your wives and children, and I will make them slaves ... I will take their property. I will do all the harm and damage to you that I can ... I declare that the deaths and...