American cities in the 19th century were walking cities-most residents worked and shopped close to where they lived. But as electric streetcar (trolley) systems were built in the 1880s, 1890s, and early 1900s, cities expanded. Many white city dwellers moved to new trolley suburbs; streetcars made it easy to travel greater distances to work, shop, and socialize in town. City streets and the patterns of people's daily lives changed.