Among the continents, Africa has the largest proportion of landlocked countries. Landlocked countries are substantially limited when it comes to food sources and international trade. The countries on the coast - South Africa, Nigeria, Kenya, Egypt, Morocco, Libya and Algeria rank comparatively better in HDI. (See references at the bottom on why being landlocked is bad). What is it about (central) Africa's history that leads to the endless violence, famine, poverty, corruption, etc. there? For the Middle East, for example, it's often about natural resources and religious conflict (in very general terms), but what about Africa?