section_path: Demographics/Populace
section_name: Populace
paragraph_text: Populace
  
  North America is the fourth most populous continent after Asia, Africa, and Europe. Its most populous country is the U.S. with 329.7 million persons. The second-largest country is Mexico with a population of 112.3 million. Canada is the third-most-populous country with 37.0 million. The majority of Caribbean island-nations have national populations under a million, though Cuba, Dominican Republic, Haiti, Puerto Rico (a territory of the U.S.), Jamaica, and Trinidad and Tobago each have populations higher than a million. Greenland has a small population of 55,984 for its massive size (2.166 million km 2 or 836,300 mi 2), and therefore, it has the world's lowest population density at 0.026 pop./km 2 (0.067 pop./mi 2).
  
  While the U.S., Canada, and Mexico maintain the largest populations, large city populations are not restricted to those nations. There are also large cities in the Caribbean. The largest cities in North America, by far, are Mexico City and New York City. These cities are the only cities on the continent to exceed eight million, and two of three in the Americas. Next in size are Los Angeles, Toronto, Chicago, Havana, Santo Domingo, and Montreal. Cities in the Sun Belt regions of the U.S., such as those in Southern California and Houston, Phoenix, Miami, Atlanta, and Las Vegas, are experiencing rapid growth. These causes included warm temperatures, retirement of Baby Boomers, large industry, and the influx of immigrants. Cities near the U.S. border, particularly in Mexico, are also experiencing large amounts of growth. Most notable is Tijuana, a city bordering San Diego that receives immigrants from all over Latin America and parts of Europe and Asia. Yet as cities grow in these warmer regions of North America, they are increasingly forced to deal with the major issue of water shortages.
  
  Eight of the top ten metropolitan areas are located in the U.S. These metropolitan areas all have a population of above 5.5 million and include the New York City metropolitan area, Los Angeles metropolitan area, Chicago metropolitan area, and the Dallas–Fort Worth metroplex. While the majority of the largest metropolitan areas are within the U.S., Mexico is host to the largest 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 the Mexico–U.S. 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 in 2004 concluded US$ 13 billion was dependent on the Detroit–Windsor international border crossing while in San Diego–Tijuana freight at the Otay Mesa Port of Entry was valued at US$20 billion.
  
  North America has also been witness to the growth of megapolitan areas. The United States includes eleven megaregions.
  
  † 2011 Census figures