Sudan has been embroiled in civil war since its independence from Britain in 1956, with conflict centered around divisions between the Arab Muslim north and non-Arab south. The second civil war between north and south lasted over two decades and killed an estimated 2 million people. A separate conflict has raged since 2003 in the western Darfur region, where government forces and allied militias have targeted civilian populations, committing genocide and war crimes. International responses have included peace negotiations, UN and AU peacekeeping missions, sanctions, and an ICC arrest warrant for Sudan's president on charges of genocide and war crimes. However, violence and humanitarian crises continue across much of Sudan.