The U.S. Cavalry was a branch of the United States Army that primarily used horses for mobility and combat. Established in the early 19th century, it played a crucial role in various conflicts, including the American Civil War and the Indian Wars. Cavalry units were known for their speed and ability to cover large distances quickly, making them effective for reconnaissance and flanking maneuvers. Over time, advancements in technology, such as the introduction of mechanized vehicles, led to the decline of traditional cavalry. By the mid-20th century, the U.S. Cavalry transitioned into armored and air cavalry units, adapting to modern warfare while retaining its historical legacy.