If you think American entities sometimes have trouble enforcing the immigration law, you should hear about how some other countries handle the challenge. This week's prime example features the small Central American nation of Belize, with China, Cuba, and Haiti all playing supporting roles. If other countries' migration-management agencies did their jobs carefully, it could be quite helpful to us, because a lot of the people violating the immigration law in Belize, for example, don't want to be in Belize at all, they want to be on their way to the U.S. There are always, as the Border Patrol puts...