By 2010 the Earth has a population of 7.2 billion people, America is the third most populated continent. The biggest Megalopolis in the world is the Pur-Ten-Cax-Cem in central Anahuac having more than 62 million people in 10 metropolitan areas, the most important of them is Tenochtitlan (27.3 million), Cacaxtla (9.7 million), Zipolite (7.3 million), Purepechcalli (7.1 million) and Cempohuallan (3.9 million).