Question: What is the oldest active Army post west of the Mississippi River?
Answer: Fort Leavenworth is the oldest active U.S. Army post west of the Mississippi River. Established in 1827 on the Kansas frontier, it has served the nation continuously for nearly two centuries. The post is home to one of the Army’s largest and oldest National Historic Landmark Districts, reflecting its pivotal role in westward expansion and military history. Fort Leavenworth is also known as the “Intellectual Center of the Army” because it houses the U.S. Army Command and General Staff College, which traces its roots to a school founded there by Gen. William T. Sherman in 1881.
