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While the U.S. Army Corps of Engineers office did identify five recorded cultural sites, they declare that the pipeline will not interfere with any historic properties.
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The U.S. government's Advisory Council on Historic Preservation declares that it is necessary to meet with Tribal Leaders to discuss the implications of the project.
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The DAPL is approved to cross under the Missouri River at the Lake Oahe reservoir and it is notes that there are no public objections.
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The Standing Rock Sioux Tribe sues the U.S. Army Corps of Engineers for inadequate consultation on the project and additionally for violating the National Historic Preservation Act.
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A group of protesters allegedly interfered and halted construction of the pipeline and as a result, Dakota Access LLC countersues the tribe.
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Energy Transfer Partners plowed through a 2-mile segment of land which destroyed multiple Native American graves and prayer sites. This action elicited violent protests between those angered by the destroyed lands and the construction companies private security guards.
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After US judge James Boasberg temporarily halted DAPL constructed while awaiting a decision to be reached in the lawsuit, more than 500 members of the North Dakota National Guard were ordered to assist local law enforcement in monitoring protests.
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The DAPL construction's was halted by the Army Corps and a review for the pipeline was underway.
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Newly elected President Trump signs an executive order to speed up the Army Corp's review and approval of the DAPL.
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Dakota Access officially re-continues construction near Lake Oahe.
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Gov. Doug Burgum instructs that protesters must leave a camp on federal land near the construction site prior to this deadline.
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Judge James Boasberg denies the Sioux tribes' requests to halt construction or to stop oil flow. The lawsuit remains unresolved, but Boasberg claims that their suit will likely be unsuccessful.
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Sioux Tribe members of Standing Rock and other Native American tribes from all over the US hit the streets of Washington DC for a four day protest asserting indigenous rights and aiming to make their opinions heard by newly elected President Trump
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A developer of the DAPL states that oil has been placed in the pipeline under a Missouri River reservoir in North Dakota. The pipeline is being prepared to be put in service, and oil will reportedly start to flow in the upcoming weeks.