Of Earth's seven continents, Asia, Africa, North America, South America, Antarctica, Europe and Oceania, Antarctica has the fewest number of nations because it has no native population. South America supports 12 nations, the second fewest number of nations per continent.
The division of Earth's surface area into continents involves the inclusion of related islands. Australia, New Zealand and the islands of Micronesia are considered to be part of Oceania. North America includes the island nations of the Caribbean. Africa, Earth's second largest continent, is home to the largest number of nations. There are 54 African countries including the various island nations.