First choose the number of cities then try to achieve the highest population among the top cities you chose. Quiz is not timed.

Latin America refers to the countries/territories listed by Wikipedia, so:

Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, French Guiana, Guadeloupe, Guatemala, Haiti, Honduras, Martinique, Mexico, Nicaragua, Panama, Paraguay, Peru, Puerto Rico, St Barthelemy, St Martin, Uruguay, and Venezuela.