The anxiety about immigrants’ diluting “American culture” that helped usher Donald J. Trump to victory has caused many Americans to forget that “American culture” itself began as an intrusion from foreign lands; Lakota people at Standing Rock also have a historically well-established reason to fear this culture. The Lakota are reminding those who will listen that this land’s original immigration problem was of European origin and it continues to threaten their lives and livelihood after half a millennium of a genocidal onslaught. Its most recent manifestation is this pipeline.