North America metropolitan area by population in North America: Greater Mexico City. Canada also breaks into the top ten largest metropolitan areas with the Toronto metropolitan area having six million people. The proximity of cities to each other on the Canada–United States border and Mexico–United States border has led to the rise of international metropolitan areas. These urban agglomerations are observed at their largest and most productive in Detroit–Windsor and San Diego–Tijuana and experience large commercial, economic, and cultural activity. The metropolitan areas are responsible for millions of dollars of trade dependent on international freight. In Detroit-Windsor the Border Transportation Partnership study
The Spanish Frontier in North America The Spanish Frontier in North America The Spanish Frontier in North America is a nonfiction book written by historian David J. Weber. The Texas Institute of Letters named it the best nonfiction book of 1992. The Spanish Ministry of Culture also recognized it. Weber followed the school of thought initiated by historian Herbert Eugene Bolton, that American history should not be centered solely around the expansion of the original thirteen colonies. Weber's book would reveal the Spanish roots and influence in North America, although he limited the definition of North America to areas north of Mexico. In a departure from