The second largest continent in the world is Africa. The continent is home to diverse populations. Each country has its own tribes, languages and cultural differences. Islam spread throughout Africa during the middle ages and remains to be the dominant religion in Northern African until today. Christianity is the second largest. The remaining are less in numbers, they include regional or local sects that have their roots in their historic tribes or countries. The countries in Africa have political systems that range from democratic, such as in South Africa, to dictatorship, such as in the Congo and Chad.