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
European medieval architecture in North America in Dearborn, Michigan. The Church of St. Mary the Virgin, Aldermanbury, London, which was designed by Sir Christopher Wren in 1677 is now in Fulton, Missouri. It includes a spiral staircase which probably dates to the 15th century. European medieval architecture in North America Medieval architecture in North America is an anachronism. Some structures in North America can however be classified as medieval, either by age or origin. In some rare cases these structures are seen as evidence on pre-Columbian trans-oceanic contact. Although much of this is pseudoscience, these buildings are of interest to American scholars of medieval architecture. Medieval