Does residential mobility change cultures, or is it merely a downstream indicator for other forces? Using large-scale surveys of citizens of 18 industrialized nations, we find that increased rates of residential mobility predicts living in a more dynamic society at least ten years in the future: one in which residents are more satisfied with their lives, have greater optimism, endorse more individualistic concepts, are more open to new ideas, have a greater sense of freedom of action, feel able to make friends more easily, express a more cosmopolitan identity, believe that their society rewards merit, and hold their community to a higher standard for treatment of minorities. These findings are echoed in the experience of Americans who have themselves recently moved, where we find that having successfully moved predicts a future sense of personal thriving, optimism, and a belief that merit is rewarded.