A book by this thinker explains how to oppose imperialism in set theoretic terms and expounds a philosophy for decolonization called “Consciencism.” This politician frequently wore (15[1])a cap (15[1])with the letters “PG” on it, standing for “prison graduate,” after being elected from prison and asked to form a government by Charles Arden-Clarke. This “showboy” politician adopted the slogan “self-government now” after breaking with (*) J. B. Danquah to found the Convention People’s Party. This leader opposed imperialism through his non-violent Positive Action Campaign. This leader nationalized cocoa exports in his country to fund the construction of the Akosombo Dam. For 10 points, name this pan-Africanist and first president of independent Ghana. ■END■