This was not started by the Sioux. It was just a bunch of people supporting Obama's position against the pipeline. Some Sioux joined in and except for a few (relatively speaking) they are not there. There are no sacred lands near the construction site. There are no Sioux lands near the construction site. The pipeline will be constructed under the lake where the Standing Rock get their water supply. The protesters have been violent from the start attacking workers, security and police. This is an unarmed Cliven Bundy occupation of federal lands type operation. They have set up a makeshift small city with some semi permanent structures and Tee Pees. The land is being destroyed more by the protesters who have been warned to get off the property or else they will be removed via force. The warnings have been going on for a couple of months and now the fed's are starting to move in and enforce the vacate order. Last I heard about 500 had been arrested since the start of this "protest".