The greatest invention of the 20 th century was the automobile. The mobility changed everyday life more than any other innovation. However, there were plenty of people who continued to depend upon horses. The transition from horses to cars created a problem in towns and cities across North Dakota. Farmers who drove horse-drawn wagons wanted to be able to leave them in front of a store, tied securely to a hitching post. However, storekeepers complained that horses obstructed business traffic and