Question: The Convention People's Party (CPP) () is a socialist political party in Ghana based on the ideas of Kwame Nkrumah,the first prime minister and president of Ghana, having led it to independence from Britain in what year?

Context paragraphs:
Samia Nkrumah: Samia Yaba Christina Nkrumah (born 23 June 1960) is a Ghanaian politician and chairperson of the Convention People's Party (CPP).  In the 2008 parliamentary election, she won the Jomoro constituency seat at her first attempt.  She is the daughter of Kwame Nkrumah, first President of Ghana.

Ghanaian parliamentary election, 1965: Parliamentary elections were held in Ghana in 1965.  As the country was a one-party state at the time, no parties except President Kwame Nkrumah's Convention People's Party (CPP), were allowed to participate.

Kwame Nkrumah: Kwame Nkrumah PC (21 September 1909 – 27 April 1972) was the first prime minister and president of Ghana, having led it to independence from Britain in 1957.  An influential advocate of Pan-Africanism, Nkrumah was a founding member of the Organization of African Unity and winner of the Lenin Peace Prize in 1962.

J. B. Danquah: Nana Joseph Kwame Kyeretwie Boakye Danquah (18 December 1895 – 4 February 1965) was a Ghanaian statesman, pan-Africanist, scholar, lawyer,historian And one of the founding fathers of the United Gold Coast Convention, the first political party that sought for the independence of the then Gold Coast which then became Ghana.  He played a significant role in pre- and post-colonial Ghana, which was formerly the Gold Coast, and in fact is credited with giving Ghana its name.  During his political career, Danquah was one of the primary opposition leaders to Ghanaian president and independence leader Kwame Nkrumah.  J. B. Danquah was described as the "doyen of Gold Coast politics" by the Watson Commission of Inquiry into the 1948 Accra riots.

Archie Casely-Hayford: Archibald "Archie" Casely-Hayford (1898 – August 1977) was a British-trained Ghanaian barrister and politician, who was involved in nationalist politics in the former Gold Coast (present-day Ghana).  Having joined the Convention People's Party (CPP), in 1951 he was elected Municipal Member for Kumasi and was appointed by Kwame Nkrumah Minister of Agriculture and Natural Resources in the government of the First Republic.  When Nkrumah declare Ghana's Independence on 6 March 1957, he was photographed on the podium flanked by Casely-Hayford, together with Kojo Botsio, Komla Agbeli Gbedemah, Nathaniel Azarco Welbeck and Krobo Edusei.

Kojo Botsio: Kojo Botsio (21 February 1916 – 6 February 2001) was a Ghanaian diplomat and politician.  He studied in Britain, where he became the treasurer of the West African National Secretariat and an acting warden for the West African Students' Union.  He served as his country's first Minister of Education and Social Welfare from 1951, as Minister for Foreign Affairs twice in the government of Kwame Nkrumah, and was a leading figure in the ruling Convention People's Party (CPP).

Convention People's Party: The Convention People's Party (CPP) () is a socialist political party in Ghana based on the ideas of the first President of Ghana, Kwame Nkrumah.

Nkrumah government: Dr. Kwame Nkrumah was the first Prime Minister and first President of Ghana.  Nkrumah had run governments under the supervision of the British government through Charles Arden-Clarke, the Governor-General.  His first government under colonial rule started from 21 March 1952 until independence.  His first independent government took office on 6 March 1957.  From 1 July 1960, Ghana became a republic and Nkrumah became the first president of Ghana.

Nkrumaism: Nkrumaism (sometimes Consciencism) is an African socialist political ideology based on the thinking and writing of Kwame Nkrumah.  Nkrumah, a pan-Africanist and Marxist–Leninist served as Prime Minister of the Gold Coast (later Ghana) from 1952 until 1960 and subsequently as President of Ghana before being deposed by the National Liberation Council in 1966.

Kwame Nkrumah Ideological Institute: The Kwame Nkrumah Ideological Institute (officially known as the Kwame Nkrumah Institute of Economics and Political Science or Winneba ideological Institute) was an educational body in Winneba founded to promote socialism in Ghana as well as the decolonization of Africa.  With the first stone being laid by Kwame Nkrumah on 18 February 1961, the Institute was designed to promote national independence, as almost all Ghanaians in the first Nkrumah government were trained in the United Kingdom or United States.  The Institute's Director was Kodwo Addison, a prominent Ghanaian activist.

Supporting paragraphs: Convention People's Party Kwame Nkrumah
Answer: 1957