China > USA

From Whiskey & Gunpowder:

China added more to global economic growth in 2007 than the U.S. That’s the first time a country other than the U.S. has contributed more to global GDP since at least the 1930s. This little history-making milestone typifies a growing list of Chinese economic achievements… and American shortcomings. “On issue after issue,” Zakaria writes, “China has become the second most important country on the planet.”