The Economic Community of West African States (ECOWAS) was created by the Treaty of Lagos on May 28, 1975, in Lagos, Lagos State, Nigeria. ECOWAS was established to promote cooperation and integration in order to create an economic and monetary union for promoting economic growth and development in West Africa. State parties – suspended from Community after 2008 coup d'état – suspended from Community after 2009 auto-coup - suspended from Community after 2010 elections Notes 1975 in Nigeria 20th century in Lagos Economic Community of West African States Treaties concluded in 1975 Treaties of Burkina Faso Treaties of Cape Verde Treaties of Ghana Treaties of Guinea Treaties of Guinea-Bissau Treaties of Ivory Coast Treaties of Liberia Treaties of Mali Treaties of Niger Treaties of Nigeria Treaties of Senegal Treaties of Sierra Leone Treaties of the Gambia Treaties of the Republic of Dahomey Treaties of Togo