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A metroplex is a contiguous metropolitan area that has more than one principal anchor city of nearly equal size or importance, commonly associated with the Dallas–Fort Worth metroplex. According to Texas Monthly, the term is a portmanteau of the terms "metropolitan" and "complex" and was created by local advertising agency TracyLocke. The North Texas Commission trademarked the term "Dallas/Fort Worth Metroplex" in 1972 as a replacement for the previously ubiquitous "North Texas". Urban areas with smaller secondary anchor cities (such as Mexico City, New York City, Los Angeles, Houston, Chicago, and Phoenix) are not considered metroplexes.