The Economic Community of West African States (ECOWAS) was formally established in Lagos on _________?

A. December 20, 1945
B. June 20. 1963
C. March 15, 1971
D. May 28, 1975

Correct Answer: Option D

D. May 28, 1975

Explanation

The ECOWAS Treaty (also known as the Treaty of Lagos)established the community when it was signed in Lagos, Nigeria, on May 28, 1975.