Right now, more than 200 members of Native American tribes and their fellow activists are camping out near Cannon Ball, North Dakota.

They've been there for months, and the protest is one of the biggest in Native American history. If you haven't been following the protests, though, let's get you up to speed:

Basically, a corporation called Energy Transfer Partners wants to build a big oil pipeline, stretching more than a thousand miles from North Dakota to Illinois. The pipeline would snake within a half-mile of the water supply that serves more than 9,000 Native Americans, and it could also disturb their sacred tribal lands.

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