Every good thing comes to an end. Since our founding -- based on ideas and principles rather than race or nationality -- America grew to become the world's most dominant power by the end of World War II. By the 1990s, once we won the Cold War, there was nobody else even close. Now we are completely falling apart. Our situation is so bad that it could be time to start debating whether we have, in fact, peaked as a country and as a world power. I sure hope not. Some aspects of our decline can be measured in numbers....