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A metroplex is a contiguous metropolitan area that has more than one principal anchor city of near equal size or importance, commonly associated with the Dallas–Fort Worth metroplex. According to the North Texas Commission (NTC), the term is a portmanteau of the terms "metropolitan" and "complex"[not in citation given] and was created by an advertising agency.[which?] The NTC 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.