It's the largest regional trade agreement in history, encompassing 12 Pacific Rim nations, 800 million people, and 40 percent of global GDP. It took years of negotiations and a special act of Congress before terms of the Trans-Pacific Partnership could be finalized on Monday.
The TPP could significantly change how business is done from the Straight of Magellan to Kuala Lumpur. That is, if it makes it through. The agreement faces strong opposition from environmentalists, unions, human rights advocates, and, as of Wednesday afternoon, Hillary Clinton. Here's what you need to know about the TPP: