We knew this was coming. The American Century, after all, was the 20th. Things were bound to go downhill.
Like fourth-century Romans and post-World War II Europeans, Americans are beginning to realize that they are no longer citizens of an unrivaled superpower. And they're kind of freaking out about it.
Using a novel "purchasing power parity" measure, the World Bank estimates that China's economy will surpass the United States later this year.