Bantu, Sudanic, and other migrants from West and Northeastern Africa arrived in the Congo River Basin between 2000 B.C. and A.D. 500. The territory that is now the Democratic Republic of the Congo is extremely diverse, with more than 200 ethnic groups that trace their histories to many communal organizations and kingdoms. The Kingdom of Kongo, for example, ruled the area around the mouth of the Congo River from the 14th to 19th centuries. Meanwhile, the Kingdoms of Luba and Lunda, located to the south and east, were also notable political groupings in the territory and ruled from the 16th and 17th centuries to the 19th century. European prospectors in the Congo Basin invaded and splintered these kingdoms in the late 1800’s, sponsored by King LEOPOLD II of Belgium, and the kingdoms were eventually forced to grant Leopold the rights to the Congo territory as his private property. During this period, known as the Congo Free State, the king's private colonial military forced the local population to produce rubber. From 1885 to 1908, millions of Congolese people died as a result of disease, inhumane treatment, and exploitation. International condemnation finally forced LEOPOLD to cede the land to the state of Belgium, creating the Belgian Congo.

The Republic of the Congo gained its independence from Belgium in 1960, but its early years were marred by instability. Col. Joseph MOBUTU seized power and declared himself president in a 1965 coup. He subsequently changed his name to MOBUTU Sese Seko and the country's name to Zaire. MOBUTU retained his position for 32 years, using sham elections and brute force. In 1994, a massive inflow of refugees from conflict in neighboring Rwanda and Burundi sparked ethnic strife and civil war. A rebellion backed by Rwanda and Uganda and fronted by Laurent KABILA toppled the MOBUTU regime in 1997. KABILA renamed the country the Democratic Republic of the Congo (DRC). In 1998, another insurrection -- again backed by Rwanda and Uganda -- challenged the KABILA regime, but troops from Angola, Chad, Namibia, Sudan, and Zimbabwe helped quell the uprising.

In 2001, KABILA was assassinated, and his son, Joseph KABILA, was named head of state. In 2002, the new president negotiated the withdrawal of Rwandan forces occupying the eastern DRC; the remaining warring parties subsequently signed the Pretoria Accord to end the fighting and establish a government of national unity. KABILA was elected as president in 2006 and 2011. The DRC constitution barred him from running for a third term, so in 2016, the DRC Government delayed national elections for two years. This fueled significant civil and political unrest, with sporadic street protests and exacerbation of tensions in the eastern DRC regions. 

The results of the 2018 elections were disputed, but opposition candidate Felix TSHISEKEDI, son of long-time opposition leader Etienne TSHISEKEDI, was announced as the election winner. This was the first transfer of power to an opposition candidate without significant violence or a coup since 1960. In December 2023, the DRC held its fourth electoral cycle since independence; TSHISEKEDI was proclaimed the winner despite some allegations of fraud, with his Sacred Union alliance retaining a large parliamentary majority.  

The DRC continues to experience violence -- particularly in the East -- perpetrated by more than 100 armed groups active in the region, including the March 23 (M23) rebel group, the ISIS-affiliated Allied Democratic Forces (ADF, or ISIS-DRC), the Democratic Forces for the Liberation of Rwanda (FDLR), and assorted local militias known as Mai Mai militias. The UN Organization Stabilization Mission in the DRC (MONUSCO) has operated in the region since 1999 and is the largest and most expensive UN peacekeeping mission in the world.