The document summarizes lessons learned from the protests against the Dakota Access Pipeline by the Standing Rock Sioux Tribe. It discusses the pipeline project itself and the key events in the protests from the perspectives of the tribe, USACE, and North Dakota. Some key takeaways are to engage tribes early in cultural resource issues, recognize tribal sovereignty, be transparent while protecting sensitive information, and realize larger historical and social contexts are involved in controversial infrastructure projects. Social media's influence on spreading information is also noted.