Khedivate of Egypt minority of European and Egyptian inhabitants. Instead of evacuating the city, Gordon prepared for a siege and held out from 1884 to 1885. However, Khartoum eventually fell, and he was killed. The British Gordon Relief Expedition was delayed by several battles, and was thus unable to reach Khartoum and save Gordon. The fall of Khartoum resulted in the proclamation of an Islamic state, ruled over first by the Mahdi and then by his successor Khalifa Abdullahi. In 1896, during the reign of Tewfik's son, Abbas II, a massive Anglo-Egyptian force, under the command of General Herbert Kitchener, began the reconquest
Khartoum Bridge (finished in October 2007) and the Tuti Bridge that links Khartoum to Tuti Island. In the 21st century, Khartoum developed based on Sudan's oil wealth (although the independence of South Sudan in 2011 affected the economy of Sudan negatively). The center of the city has tree-lined streets. Khartoum has the highest concentration of economic activity in the country. This has changed as major economic developments take place in other parts of the country, like oil exploration in the South, the Giad Industrial Complex in Al Jazirah state and White Nile Sugar Project in Central Sudan, and the Merowe Dam