evidence: More than half of the world's population now live in urban areas — increasingly in highly dense cities. However, urban settings are a relatively new phenomenon in human history. This transition has transformed the way we live, work, travel, and build networks. [...] UN estimates: More than half of the world’s population live in urban areas [...] Here we have a handful of countries — such as Mongolia, Paraguay, Uruguay, Liberia, and Armenia — where more than half of the country's urban population live in its largest city. Overall, this share tends to be higher in countries across Africa and Latin America; a share of 30 to 50% is common. Rates across Europe, Asia, and North America are highly variable, ranging from over 40% to less than 10%.