AP -- Olympic gold medalist wrestler Gable Steveson has achieved his childhood dream of signing with World Wrestling Entertainment. But he still plans to defend his college heavyweight wrestling title for the University of Minnesota.

Get our free mobile app

Such deals are now allowed after the NCAA cleared the way for athletes to earn endorsement money without putting their eligibility at risk. It is the WWE's first deal with a college athlete.

Inside Amazon: A Detailed History of America's Biggest Online Retailer

Stacker compiled a list of key moments in Amazon's history and its current business from a variety of sources. Here's a look at the events that turned an online bookstore into a global conglomerate and a self-made entrepreneur into the world's second-richest man.