All U.S. cities were designed on the gridiron pattern and none were based upon the modified wheel, as were some European cities.

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Many U.S. cities were designed on the gridiron pattern, but not all. Some cities, including Washington D.C., were designed with elements of the modified wheel pattern, similar to some European cities. The gridiron pattern is common, but urban planning in the U.S. has been influenced by a variety of design philosophies.

All US Cities Were Designed on the Gridiron Pattern and None