In December 2019 , the party merged with the Afar National Democratic Party ( ANDP ) , the Amhara Democratic Party ( ADP ) , the Ethiopian Somali People 's Democratic Party ( ESPDP ) , the Gambela People 's Democratic Movement ( GPDM ) , the Hareri National League ( HNL ) , the Oromo Democratic Party ( ODP ) and the Southern Ethiopian People 's Democratic Movement ( SEPDM ) to form the Prosperity Party .