The Second Sudanese Civil War started in 1983, although it was largely a continuation of the First Sudanese Civil War

First Sudanese Civil War

The First Sudanese Civil War was a conflict from 1955 to 1972 between the northern part of Sudan and the southern Sudan region that demanded representation and more regional autonomy...

 of 1955 to 1972. Although it originated in southern Sudan

South Sudan

South Sudan , officially the Republic of South Sudan, is a landlocked country located in the Sahel region of northeastern Africa. It is also part of the North Africa UN sub-region. Its current capital is Juba, which is also its largest city; the capital city is planned to be moved to the more...

, the civil war spread to the Nuba mountains

Nuba Mountains

Nuba Mountains is an area located in South Kordofan, Sudan. The area is home to a group of indigenous ethnic groups known collectively as the Nuba peoples. In the 18th century, Nuba Mountains became home to the kingdom of Taqali that controlled the hills of the mountains until their defeat by...

 and Blue Nile

Blue Nile

The Blue Nile is a river originating at Lake Tana in Ethiopia. With the White Nile, the river is one of the two major tributaries of the Nile...

 by the end of the 1980s.

Roughly two million people have died as a result of war, famine and disease caused by the conflict. Four million people in southern Sudan

Sudan

Sudan , officially the Republic of the Sudan , is a country in North Africa, sometimes considered part of the Middle East politically. It is bordered by Egypt to the north, the Red Sea to the northeast, Eritrea and Ethiopia to the east, South Sudan to the south, the Central African Republic to the...

 have been displaced at least once (and often repeatedly) during the war.