Today, Africa contains 53 independent and sovereign countries, which mostly still have the borders drawn during the era of European colonialism.
Since colonialism, African states have frequently been hampered by instability, corruption, violence, and authoritarianism. The vast majority of African nations are republics that operate under some form of the presidential system of rule. However, few of them have been able to sustain democratic governments, and many have instead cycled through a series of coups, producing military dictatorships. A number of Africa's post-colonial political leaders were military generals who were poorly educated and ignorant on matters of governance. Great instability, however, was mainly the result of marginalization of other ethnic groups and graft under these leaders. For political gain, many leaders fanned ethnic conflicts that had been exacerbated, or even created, by colonial rule. In many countries, the military was perceived as being the only group that could effectively maintain order, and it ruled many nations in Africa during the 1970s and early 1980s. During the period from the early 1960s to the late 1980s, Africa had more than 70 coups and 13 presidential assassinations. Border and territorial disputes were also common, with the European-imposed borders of many nations being widely contested through armed conflicts.
Cold War conflicts between the United States and the Soviet Union, as well as the policies of the International Monetary Fund, also played a role in instability. When a country became independent for the first time, it was often expected to align with one of the two superpowers. Many countries in Northern Africa received Soviet military aid, while many in Central and Southern Africa were supported by the United States, France or both. The 1970s saw an escalation, as newly independent Angola and Mozambique aligned themselves with the Soviet Union and the West and South Africa sought to contain Soviet influence by funding insurgency movements. Some countries were ruled by communist parties that sought to impose Soviet policies resulting in atrocities such as the Ethiopian famine of 1985-89.
AIDS has also been a prevelant issue in post-colonial africa. However, in the last year, AIDS has been reduced about 25% due to new diagnostic and preventative measures.