The Glorieta Pass Battlefield was the site of an American Civil War battle that ended Confederate ambitions to cut off the West from the Union. The Battle of Glorieta Pass took place on March 26–28, 1862, at Glorieta Pass, on the Santa Fe Trail between the Pecos River and Santa Fe, New Mexico. The pass, and the battlefield, are now bisected by Interstate 25. Two portions of the battlefield, now publicly owned and operated by the National Park Service as part of Pecos National Historical Park, were declared a National Historic Landmark in 1961.