Majority Social Democratic Party of Germany in the context of "German Revolution of 1918–1919"

The German revolution of 1918–1919, also known as the November Revolution (German: Novemberrevolution), was an uprising started by workers and soldiers in the final days of World War I. It quickly and almost bloodlessly brought down the German Empire. In its more violent second stage, the supporters of a parliamentary republic were victorious over those who wanted a Soviet-style council republic. The defeat of the forces of the far left cleared the way for the establishment of the Weimar Republic. The key factors leading to the revolution were the extreme burdens suffered by the German people during the war, the economic and psychological impacts of the Empire's defeat, and the social tensions between the general populace and the aristocratic and bourgeois elite.

The revolution began in late October 1918 with a sailors' mutiny at Kiel. Within a week, workers' and soldiers' councils were in control of government and military institutions across most of the Reich. On 9 November, Germany was declared a republic. By the end of the month, all of the ruling monarchs, including Emperor Wilhelm II, had been forced to abdicate. On 10 November, the Council of the People's Deputies was formed by members of Germany's two main socialist parties. Under the de facto leadership of Friedrich Ebert of the moderate Majority Social Democratic Party (MSPD), the Council acted as a provisional government that held the powers of the emperor, chancellor and legislature. It kept most of the old imperial officer corps, administration and judiciary in place so that it could use their expertise to address the crises of the moment.

The proclamation of the republic in Germany took place in Berlin twice on 9 November 1918, the first at the Reichstag building by Philipp Scheidemann of the Majority Social Democratic Party of Germany (MSPD) and the second a few hours later by Karl Liebknecht, the leader of the Marxist Spartacus League, at the Berlin Palace.

In the German Revolution of 1918–1919, during which Social Democrats and Spartacists were among the groups that fought to determine the country's future form of government, it was the MSPD and the ideas of the bourgeois-democratic parties that prevailed over the Spartacists and their more radical idea of a soviet-style republic. The German Empire was transformed from a monarchy into a parliamentary democratic republic with a liberal constitution. Scheidemann's speech marked the point at which the Empire could be said to have ended and the Weimar Republic born.

The Social Democratic Party of Germany (German: Sozialdemokratische Partei Deutschlands [zoˈtsi̯aːldemoˌkʁaːtɪʃə paʁˌtaɪ ˈdɔʏtʃlants], SPD [ɛspeːˈdeː] ) is a social democratic political party in Germany. It is one of the major parties of contemporary Germany. Lars Klingbeil has been the party's leader since the 2021 SPD federal Party convention together with Bärbel Bas, who joined him in June 2025. After losing the 2025 federal election, the party is part of the Merz government as the junior coalition partner. The SPD is a member of 12 of the 16 German state governments and is a leading partner in seven of them.

The SPD was founded in 1875 from a merger of smaller socialist parties, and grew rapidly after the lifting of Germany's repressive Anti-Socialist Laws in 1890 to become the largest socialist party in Western Europe until 1933. In 1891, it adopted its Marxist-influenced Erfurt Program, though in practice it was moderate and focused on building working-class organizations. In the 1912 federal election, the SPD won 34.8 percent of votes and became the largest party in the Reichstag, but was still excluded from government. After the start of the First World War in 1914, the party split between a pro-war mainstream and the anti-war Independent Social Democratic Party, some members of which later formed the Communist Party of Germany (KPD). The SPD played a leading role in the German revolution of 1918–1919 and in the foundation of the Weimar Republic. The SPD politician Friedrich Ebert served as the first president of Germany from 1919 to 1925.

The Communist Party of Germany (German: Kommunistische Partei Deutschlands, pronounced [kɔmuˈnɪstɪʃə paʁˈtaɪ ˈdɔʏtʃlants] ; KPD [ˌkaːpeːˈdeː] ) was the major far-left political party in the Weimar Republic during the interwar period, an underground resistance movement in Nazi Germany, and a minor party in Allied-occupied Germany and West Germany during the post-war period until it merged with the SPD in the Soviet occupation zone in 1946 and was banned by the West German Federal Constitutional Court in 1956.

The construction of the KPD began in the aftermath of the First World War by Rosa Luxemburg's and Karl Liebknecht's faction of the Independent Social Democratic Party of Germany (USPD) who had opposed the war and the Majority Social Democratic Party of Germany (MSPD)'s support of it.