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
Bahá'í Faith in South America of some 83 tribes of Native Americans had joined the religion. Among the Central and South American indigenous there are substantial populations of native Bahá'ís. An informal summary of the Wayuu ( a tribe living in La Guajira Desert) community in 1971 showed about 1000 Bahá'ís. The largest population of Bahá'ís in South America is in Bolivia, a country whose population is estimated to be 55%–70% indigenous and 30%–42% Mestizo, with a Bahá'í population estimated at 206,000 in 2005 according to the Association of Religion Data Archives. Relationships between North American and South American Indian populations have been fostered by