Horses have been bred since antiquity. Their use for transportation was curtailed in the early 1900s as [[automobile]]s (then called "horseless carriages") replaced them. In [[US Customary System of Units|imperial measurement]]s, motors are still measured in terms of [[horsepower]]. | Horses have been bred since antiquity. Their use for transportation was curtailed in the early 1900s as [[automobile]]s (then called "horseless carriages") replaced them. In [[US Customary System of Units|imperial measurement]]s, motors are still measured in terms of [[horsepower]]. |