The United States of Africa is the name proposed for the concept of a federation of the 53 sovereign states of Africa, with a combined population of just over 1 billion. The United States of Africa, if created, would share the acronym "U.S.A." with the United States of America. 
Libyan leader Muammar al-Gaddafi, who is the 2009 Chairperson of the African Union (AU), has advanced the idea of a United States of Africa at two regional African summits: in June 2007 in Conakry, Guinea, and again in February 2009 in Addis Ababa, Ethiopia. Gaddafi had previously pushed for the creation of the African Union at a summit in Lomé, Togo, in 2000. Having since described the AU as a failure, Gaddafi has asserted that only a true pan-African state can provide stability and wealth to Africa.
A number of senior AU members also support the proposed federation, believing that it could bring peace to a 'new' Africa. Alpha Oumar Konaré, former President of Mali and Chairperson of the African Commission on Human and Peoples' Rights, spoke in favour of the concept at the commemoration of Africa Day, on May 25, 2006.
The "United States of Africa" was mentioned first by the Jamaican thinker Marcus Garvey in his poem 'Hail, United States of Africa' in 1924. Garvey's ideas deeply influenced the birth of the Pan-Africanist movement which culminated in 1945 with the Fifth Pan-African Congress in Manchester, United Kingdom, attended by W. E. B. Du Bois, Patrice Lumumba, George Padmore, Jomo Kenyatta and Kwame Nkrumah. Later, Nkrumah and Haile Selassie (among many others) took the idea forward to form the 37 nation Organisation of African Unity, the forerunner of today's African Union.
The idea of a multinational unifying African state is seen by the French publication Le Monde diplomatique as a successor to the medieval African empires: the Ethiopian Empire, the Ghana Empire, the Mali Empire, the Songhai Empire, the Benin Empire, the Kanem Empire and other historic nation states.
From these origins, and as a result of the more recent colonialism, Africa has today developed into a continent of 53 independent countries, with a population of 1 billion. The proposed federation would have the largest total territory of any state, exceeding the Russian Federation. It would also be the third most populous state after China and India, and with a population speaking an estimated 2,000 languages.
At the June 2007 meeting of the African Union, discussions centred upon Gaddafi's idea of a federation of African states.
In February 2009, upon being elected chairman of the 53-nation African Union in Ethiopia, Gaddafi told the assembled African leaders: "I shall continue to insist that our sovereign countries work to achieve the United States of Africa." The BBC reported that Gaddafi had proposed "a single African military force, a single currency and a single passport for Africans to move freely around the continent". Other African leaders stated they would study the proposal's implications, and rediscuss it in May 2009.
While development remains in the early stages of planning, ambitious targets have been set. The focus so far has been on building subdivisions of Africa - the proposed East African Federation can be seen as an example of this. The President of Senegal, Abdoulaye Wade, has indicated that the United States of Africa may exist from as early as 2017. The African Union, by contrast, has set itself the task of building a "united and integrated" Africa by 2025. Gaddafi has also indicated that the proposed federation may extend as far west as the Caribbean: Haiti, Jamaica, the Dominican Republic, and other islands featuring a large African diaspora, may be invited to join.
Of the African nations other than Libya, support for the "United States of Africa" has come from Ghana, Senegal and Zimbabwe. Others, such as South Africa, Kenya and Nigeria, have shown less interest in the idea.
Doubts have been raised about whether the goal of a unified Africa can ever be achieved while ongoing problems of conflict and poverty persist throughout the continent. Gaddafi has also received criticism for his involvement in the movement, and lack of support for the idea from among other African leaders. Richard Dowden, director of the Royal African Society, said: "The African Union has got all these aspirations to be a club of democrats – and this is a man who has been a dictator for 40 years."