OM VS ). ▁ ▁The ▁internal ▁cap ability ▁of ▁the ▁RE C s ▁var ies ▁consider ably , ▁with ▁E CO W AS , ▁S AD C ▁and ▁E AC ▁the ▁most ▁developed . ▁Moreover , ▁though ▁the ▁RE C s ▁are ▁en vis aged ▁as ▁the ▁building ▁blocks ▁of ▁the ▁African ▁Union , ▁there ▁is ▁no ▁clear ▁evidence ▁that ▁all ▁existing ▁RE C s ▁have ▁the ▁aim ▁of ▁long - term ▁contin ental ▁integration ▁in ▁view , ▁nor ▁that ▁there ▁is ▁the ▁political ▁will ▁within ▁all ▁the ▁RE C s ▁to ▁submit ▁regional ▁concerns ▁to ▁the ▁overrid ing ▁imper atives ▁of ▁the ▁Union . ▁ ▁See ▁also ▁ ▁Econom ic ▁integration ▁ ▁List ▁of ▁trade ▁b loc s ▁ ▁References ▁ ▁Link s ▁to ▁RE C ▁websites ▁ ▁Rec ogn ised ▁by ▁the ▁A U ▁ ▁Arab ▁Mag h reb ▁Union ▁( U MA ) ▁ ▁Common ▁Market ▁for ▁Eastern ▁and ▁Southern ▁Africa ▁( CO ME SA ) ▁ ▁Community ▁of ▁Sah el - ▁Sah aran ▁States ▁( C EN - S AD ) ▁▁ ▁East ▁African ▁Community ▁( E AC ) ▁▁ ▁Econom ic ▁Community ▁of ▁Central ▁African ▁States ▁( E CC AS ) ▁ ▁Econom ic ▁Community ▁of ▁West ▁African ▁States ▁( E CO W AS ) ▁ ▁Inter g overn ment al ▁Author ity ▁on ▁Development ▁( IG AD ) ▁ ▁Southern ▁Africa ▁Development ▁Community ▁( S AD C ) ▁ ▁O thers ▁ ▁Econom ic ▁and ▁Mon et ary ▁Community ▁of ▁Central ▁Africa ▁▁ ▁West ▁African ▁Econom ic