is surely a universal truth that men and women who choose voluntarily to pack up everything, acquire a wagon, set off down a rutted track into the sunset, and then endure weeks and months of privation, misery, and real danger in order to create new homes for themselves countless miles elsewhere must have a powerful reason for doing so. Modern America’s very existence is based on the awe-inspiring reality that thousands upon thousands made this very choice. And at first blush it appears they had just as many thousands of reasons for setting forth toward the sunset.