The establishment of modern Sino-African relations dates back to the late 1950s when China signed the first official bilateral trade agreement with Algeria, Egypt, Guinea, Somalia, Morocco and Sudan. Zhou Enlai made a ten-country tour to Africa between December 1963 and January 1964. Zhou Enlai visited Ghana and established close relations with Kwame Nkrumah, was a leader who strived for a united Africa. Relations at that time were often reflective of Chinese foreign policy in general: China "began to cultivate ties and offer[...] economic, technical and military support to African countries and liberation movements in an effort to encourage wars of national liberation and revolution as part of an international united front against both superpower".