In the early 2000s, the Keystone XL oil pipeline became one of the most powerful symbols in the fight against climate change. And since then, it's not just local landowners fighting pipelines in their backyards anymore. It's environmental groups, Native Americans tribes, farmers and ranchers, and...

Pipelines have become a potent issue for Native American and indigenous people, who are fighting them across North America. Part of the fight is over culture and identity. But it also involves a messy history of land and treaties, and a long, complicated relationship with the U.S. government.