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
North America the largest Muslim population in North America with 2.7 million or 0.9%, While Canada host about one million Muslim or 3.2% of the population. While in Mexico there were 3,700 Muslims in the country. In 2012, "U-T San Diego" estimated U.S. practitioners of Buddhism at 1.2 million people, of whom 40% are living in Southern California. The predominant religion in Central America is Christianity (96%). Beginning with the Spanish colonization of Central America in the 16th century, Roman Catholicism became the most popular religion in the region until the first half of the 20th century. Since the 1960s, there has