ECCAS: History

1981 Leaders of the Central African Customs and Economic Union (UDEAC) agree to form a wider economic community of Central African States.
ECCAS is established by the The Customs and Economic Union of Central Africa (UDEAC) and members of the Economic Community of the Great Lake States (CEPGL). 1983
1985 ECCAS begins functioning, but is inactive for several years due to the non-payment of membership fees and the war in the Democratic Republic of the Congo.
Angola becomes a full member of ECCAS. ECCAS signs the Protocol on Relations between the African Economic Community and regional economic communities. 1999
2002 The 10th Ordinary Session of Heads of State and Government takes place. Summit decides to adopt a protocol on the establishment of a Network of Parliamentarians of Central Africa and to adopt the standing orders of the Council for Peace and Security in Central Africa. Rwanda is also officially welcomed upon its return as a full member of ECCAS.
11th Ordinary Session takes place in which a declaration on the implementation of the New Economic Program for African Development and also a declaration on gender. 2004
2007 Rwanda leaves ECCAS to focus upon its membership in the EAC and COMESA.
The ECCAS is made eligible under the U.S. Arms Export Control Act for the furnishing of defense articles and services. 2009
2015 Rwanda rejoins ECCAS, eight years after pulling out of the regional bloc.

Sources

African Union: ECCAS - History and Background

Glossary