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 others in Central and Southern Africa were supported by the United States, France or both. The 1970s saw an escalation of Cold War intrigues, as newly independent Angola and Mozambique aligned themselves with the Soviet Union, and the West and South Africa sought to contain Soviet influence by supporting friendly regimes or insurgency movements. In Rhodesia, Soviet and Chinese-backed leftist guerrillas of the Zimbabwe Patriotic Front waged a brutal guerrilla war against the country's white government. There was a major famine in Ethiopia, when hundreds of thousands of people starved. Some claimed that Marxist economic policies made the situation worse. The most devastating military conflict in modern independent Africa has been the Second Congo War; this conflict and its aftermath has killed an estimated 5.5 million people. Since 2003 there has been an ongoing conflict in Darfur which has become a humanitarian disaster. Another notable tragic event is the 1994 Rwandan genocide in which an estimated 800,000 people were murdered.