Hang on to your hats, America.

And throw away that big, fat styrofoam finger while you're about it.

There's no easy way to say this, so I'll just say it: We're no longer No. 1. Today, we're No. 2. Yes, it's official. The Chinese economy just overtook the United States economy to become the largest in the world. For the first time since Ulysses S. Grant was president, America is not the leading economic power on the planet.

It just happened — and almost nobody noticed.