During which era of the Historical Evolution of the U.S. City were cities compact, usually about 3-4 miles in diameter?

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The Pedestrian/Horsecar era, which lasted from the early 1800s to the late 1800s, was characterized by compact cities that were usually limited to about 3-4 miles in diameter. This was due to the fact that the primary modes of transportation during this time were walking and horse-drawn carriages, which limited the distance people could travel within a reasonable amount of time. As a result, cities were built to be compact and dense, with a mix of residential, commercial, and industrial uses all coexisting within a relatively small area.

During Which Era of the Historical Evolution of the U