In Chawosauria, the Social Democratic-Green Party Alliance (also known as the SDGPA) is a bipartisan electoral fusional alliance between the Social Democratic Workers' Labour Party and the Grassroots Democratic People's Green Party of Chawosauria that was formed on September 18, 2018. This bipartisan alliance was formed due to an electoral fusional candidacy of Jonathan Dragan Bismarck XX, the great-grandson of Chawosaurian Prime Minister, Jonathan Dragan Bismarck XVII.  

The alliance began opposing Degotoga K. Atagulkalu's war policies, criticized his slow activities in the investigations into the Poseidon oil rig blowout, and his silence of the Great Blackout, a nationwide power outage caused by the shortage of coal. Their alliance went into full effect when on the evening of December 5, 2018, the alliance broke away from the Left-Wing Coalition, permanently weakened Degotoga K. Atagulkalu's power and leverage over the Chawopolis Palace, and this break-up led to a quick transition of the Left-Wing Coalition, from a Supermajority coalition to a minority coalition. The Social Democratic-Green Party Alliance became the largest coalition in the Palace, but no coalition has a clear majority (501 seats needed for a majority).  

The alliance's withdraw from the Left-Wing Coalition will be officialized on January 1, 2019, and a new joint session of the January 1, 2018-December 31, 2019 government will start by January 3, 2019.