Nigeria's role in the African Union was most prominent during the regime of

Nigeria has played a significant role in the African Union (AU) since its inception. However, the country's most prominent role in the AU was during the regime of President Olusegun Obasanjo, who served as President from 1999 to 2007. During his tenure, President Obasanjo was a vocal advocate for African unity and played a key role in promoting peace and stability in various African countries. He also led efforts to strengthen the AU, including pushing for the establishment of the New Partnership for Africa's Development (NEPAD) and advocating for the African Peer Review Mechanism (APRM) to promote good governance and democracy. Under President Obasanjo's leadership, Nigeria also contributed troops to peacekeeping missions in several African countries, including Sierra Leone, Liberia, and Sudan. Overall, President Obasanjo's leadership and vision for African unity and development helped to elevate Nigeria's role in the African Union and on the global stage.