History of Sudan
The modern Republic of Sudan was formed in 1956 and inherited its boundaries from Anglo-Egyptian Sudan, established in 1899. For times predating 1899, usage of the term "Sudan" for the territory of the Republic of Sudan was somewhat anachronistic, and may have referred to the more diffuse concept of the Sudan.
South Sudan
The United States supported the 2011 referendum on South Sudan's independence. The "New York Times" reported that "South Sudan is in many ways an American creation, carved out of war-torn Sudan in a referendum largely orchestrated by the United States, its fragile institutions nurtured with billions of dollars in American aid." The U.S. government's long-standing sanctions against Sudan were officially removed from applicability to newly independent South Sudan in December 2011, and senior RSS officials participated in a high-level international engagement conference in Washington, D.C., to help connect foreign investors with the RSS and South Sudanese private sector representatives. Given the interdependence between some sectors of the economy of the Republic of South Sudan and the Republic of Sudan, certain activities still require OFAC authorization. Absent a license, current Sudanese sanction regulations will continue to prohibit U.S. persons from dealing in property and interests that benefit Sudan or the Government of Sudan. A 2011 Congressional Research Service report, "The Republic of South Sudan: Opportunities and Challenges for Africa’s Newest Country", identifies outstanding political and humanitarian issues as the country forges its future.