North America million, though Cuba, Dominican Republic, Haiti, Puerto Rico (a territory of the United States), Jamaica, and Trinidad and Tobago each have populations higher than a million. Greenland has a small population of 55,984 for its massive size (2,166,000 km² or 836,300 mi²), and therefore, it has the world's lowest population density at 0.026 pop./km² (0.067 pop./mi²). While the United States, 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. These cities
Streetcars in North America order of opening): In addition, the CityLynx Gold Line, which opened in Charlotte, North Carolina, in 2015 using replica-vintage streetcars (see table of heritage streetcar systems, below), is planned to be converted to modern streetcars in 2020. In 2001, Portland, Oregon, which already had a successful light rail system (MAX), became the first city in North America in more than 50 years to open a new streetcar system served by modern vehicles, with the opening of the Portland Streetcar. It uses low-floor cars built in the Czech Republic, but the system's first U.S.-assembled streetcar was delivered in 2009. The line