During his time in the United States, Nkrumah preached at black Presbyterian Churches in Philadelphia and New York City. He read books about politics and divinity, and tutored students in philosophy. Nkrumah encountered the ideas of Marcus Garvey, and in 1943 met and began a lengthy correspondence with Trinidadian Marxist C.L.R. James, Russian expatriate Raya Dunayevskaya, and Chinese-American Grace Lee Boggs, all of whom were members of a US based Trotskyist intellectual cohort. Nkrumah later credited James with teaching him 'how an underground movement worked'.
He arrived in London in May 1945 intending to study at the LSE. After meeting with George Padmore, he helped organize the Fifth Pan-African Congress in Manchester, England. Then he founded the West African National Secretariat to work for the decolonization of Africa. Nkrumah served as Vice-President of the West African Students' Union (WASU).
Over his lifetime, Nkrumah was awarded honorary doctorates by Lincoln University, Moscow State University; Cairo University in