Chad-Sudan relations: Chad declares a state of war against Sudan following a December 18 attack on Adré, which left about 100 people dead.
Sudan (English: or ; Arabic: , romanized: as-Sdn), officially the Republic of the Sudan (Arabic: , romanized: Jumhriyyat as-Sdn), is a country in Northeast Africa. It shares borders with the Central African Republic to the southwest, Chad to the west, Egypt to the north, Eritrea to the northeast, Ethiopia to the southeast, Libya to the northwest, South Sudan to the south and the Red Sea. It has a population of 45.70 million people as of 2022 and occupies 1,886,068 square kilometres (728,215 square miles), making it Africa's third-largest country by area, and the third-largest by area in the Arab League. It was the largest country by area in Africa and the Arab League until the secession of South Sudan in 2011, since which both titles have been held by Algeria. Its capital is Khartoum and its most populated city is Omdurman (part of the metropolitan area of Khartoum).
Sudan's history goes back to the Pharaonic period, witnessing the Kingdom of Kerma (c. 25001500 BC), the subsequent rule of the Egyptian New Kingdom (c. 1500 BC1070 BC) and the rise of the Kingdom of Kush (c. 785 BC350 AD), which would in turn control Egypt itself for nearly a century. After the fall of Kush, the Nubians formed the three Christian kingdoms of Nobatia, Makuria, and Alodia, with the latter two lasting until around 1500. Between the 14th and 15th centuries, most of Sudan was gradually settled by Arab nomads. From the 16th to the 19th centuries, central and eastern Sudan were dominated by the Funj sultanate, while Darfur ruled the west and the Ottomans the east.
During the Mamluk and Ottoman periods, slave trade played a big role and was demanded from the Sudanese Kashif as the regular remittance of tribute. In 1811, Mamluks established a state at Dunqulah as a base for their slave trading. Under Turco-Egyptian rule of Sudan after the 1820s, the practice of trading slaves was entrenched along a northsouth axis, with slave raids taking place in southern parts of the country and slaves being transported to Egypt and the Ottoman empire.From the early 19th century, the entirety of Sudan was conquered by Egypt under the Muhammad Ali dynasty. It was under Egyptian rule that Sudan acquired its modern borders and began the process of political, agricultural, and economic development. In 1881, nationalist sentiment in Egypt led to the Orabi Revolt, "weakening" the power of the Egyptian monarchy, and eventually leading to the occupation of Egypt by the United Kingdom. At the same time, religious-nationalist fervour in Sudan erupted in the Mahdist Uprising led by the self-proclaimed Mahdi Muhammad Ahmad, and resulting in the establishment of the Caliphate of Omdurman. The Mahdist forces were eventually defeated by a joint Egyptian-British military force, restoring the authority of the Egyptian monarch. However, Egyptian sovereignty in Sudan would henceforth be rather nominal, as the true power in both Egypt and Sudan was now the United Kingdom. In 1899, under British pressure, Egypt agreed to share sovereignty over Sudan with the United Kingdom as a condominium. In effect, Sudan was governed as a British possession. The 20th century saw the growth of both Egyptian and Sudanese nationalism focusing on ending the United Kingdom's occupation. The Egyptian revolution of 1952 toppled the monarchy and demanded the withdrawal of British forces from all of Egypt and Sudan. Muhammad Naguib, one of the two co-leaders of the revolution, and Egypt's first President, who was half-Sudanese and had been raised in Sudan, made securing Sudanese independence a priority of the revolutionary government. The following year, under Egyptian and Sudanese pressure, the United Kingdom agreed to Egypt's demand for both governments to terminate their shared sovereignty over Sudan and to grant Sudan independence. On 1 January 1956, Sudan was duly declared an independent state.
After Sudan became independent, the Jaafar Nimeiry regime began Islamist rule. This exacerbated the rift between the Islamic North, the seat of the government, and the Animists and Christians in the South. Differences in language, religion, and political power erupted in a civil war between government forces, influenced by the National Islamic Front (NIF), and the southern rebels, whose most influential faction was the Sudan People's Liberation Army (SPLA), which eventually led to the independence of South Sudan in 2011. Between 1989 and 2019, Sudan experienced a 30-year-long military dictatorship led by Omar al-Bashir, who was accused of human rights abuses, including torture, persecution of minorities, allegations of sponsoring global terrorism, and ethnic genocide due to its actions in the War in the Darfur region that broke out in 2003. Overall, the regime's actions killed an estimated 300,000 to 400,000 people. Protests erupted in 2018, demanding Bashir's resignation, which resulted in a coup d'tat on 11 April 2019 and Bashir's imprisonment.Islam was Sudan's state religion and Islamic laws were applied from 1983 until 2020 when the country became a secular state. The economy has been described as lower-middle income, with over 35% population living in poverty, largely relies on agriculture due to long-term international sanctions and isolation, as well as a long history of internal instability and factional violence, to some extent on oil production in the oil fields of South Sudan. Sudan is a member of the United Nations, the Arab League, African Union, COMESA, Non-Aligned Movement and the Organisation of Islamic Cooperation.
The populations of eastern Chad and western Sudan established social and religious ties long before either nation's independence, and these remained strong despite disputes between governments. In recent times, relations have been strained due to the conflict in Darfur and a civil war in Chad, which both governments accuse the other of supporting.