Nigeria's foreign policy was soon tested in the 1970s after the country emerged united from its own civil war and quickly committed itself to the liberation struggles going on in the Southern Africa sub-region. Though Nigeria never sent an expeditionary force in that struggle, it offered more than rhetoric to the African National Congress (ANC) by taking a committed tough line with regard to the racist regime and their incursions in southern Africa, in addition to expediting large sums to aid anti-colonial struggles. Nigeria was also a founding member of the Organisation for African Unity (now the African Union), and has tremendous influence in West Africa and Africa on the whole. Nigeria has additionally founded regional cooperative efforts in West Africa, functioning as standard-bearer for ECOWAS and ECOMOG, economic and military organizations respectively.
With this African-centred stance, Nigeria readily sent troops to the Congo at the behest of the United Nations shortly after independence (and has maintained membership since that time); Nigeria also supported several Pan African and pro-self government causes in the 1970s, including garnering support for Angola's MPLA, SWAPO in Namibia, and aiding anti-colonial struggles in Mozambique, and Zimbabwe (then Rhodesia) military and economically.
Nigeria retains membership in the Non-Aligned Movement, and in late November 2006 organized an Africa-South America Summit in Abuja to promote what some attendees termed "South-South" linkages on a variety of fronts.Nigeria is also a member of the International Criminal Court, and the Commonwealth of Nations, from which it was temporarily expelled in 1995 under the Abacha regime.
Nigeria has remained a key player in the international oil industry since the 1970s, and maintains membership in Organization of the Petroleum Exporting Countries OPEC which it joined in July, 1971. Its status as a major petroleum producer figures prominently in its sometimes vicissitudinous international relations with both developed countries, notably the United States and more recently China and developing countries, notably Ghana, Jamaica and Kenya.
Millions of Nigerians have emigrated at times of economic hardship to Europe, North America and Australia among others. It is estimated that over a million Nigerians have emigrated to the United States and constitute the Nigerian American populace. Of such Diasporic communities include the "Egbe Omo Yoruba" society.
