Then-Nebraska Gov. Dave Heineman sends a letter to President Barack Obama asking that the proposed Keystone XL pipeline avoid the Sandhills, an area consisting of fragile, grass-covered sand dunes in western Nebraska.
August 2011: Request to avoid Sandhills
Notable events in the dispute over the Keystone XL oil pipeline, which is slated to run from Canada to U.S. refineries in the Gulf Coast.
