Final answer:
Circuit riding ended due to the introduction of more efficient transportation methods like railroads and electrified streetcars, and the expansion of urban centers and the judicial system.
Step-by-step explanation:
Two reasons why the practice of circuit riding ended revolve around the advancements in transportation technology and changes in societal structures. As transportation became more efficient with the introduction of railroads, electrified streetcars, and underground railroads, the necessity for judges and other officials to travel long distances by horseback to carry out their duties decreased significantly. Additionally, as urban centers grew and the judicial system expanded, it became more practical to establish permanent courthouses closer to populations rather than continue the rigorous and time-consuming practice of circuit riding.