A US league is a unit of measurement used in the United States to represent a distance. It is primarily used in historical contexts and is equivalent to three miles or 15,840 feet. The term "league" originated from the Latin word "leuca," which referred to a distance that could be covered in an hour's walk. In the past, leagues were commonly used to measure distances between towns or to describe the length of a journey. They were particularly useful in determining the distance covered by a ship at sea. However, with the advent of more precise and standardized units of measurement, such as the mile and kilometer, the use of leagues has become less common in modern times.