The instrument establishing the Economic Community of West African State in 1975 is

The instrument that established the Economic Community of West African States (ECOWAS) in 1975 is a treaty. A treaty is an agreement or contract between two or more countries or organizations that outlines the terms and conditions for their relationship or cooperation. In the case of ECOWAS, the treaty established the regional organization to promote economic cooperation and integration among its member states in West Africa. The treaty outlined the goals, objectives, and institutional framework for the organization, and provided a legal basis for its operations and activities.