The most successful pre-World War I Socialist party was the

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The German Social Democratic Party (SPD) was the most successful pre-World War I socialist party. It was the largest Marxist party in Europe and played a significant role in both German politics and international socialist movements. The SPD won the most votes in the 1912 German federal election and controlled the most seats in the Reichstag. Its success was largely due to its focus on electoral politics and the gradual transformation of society towards socialism, as opposed to more radical revolutionary methods advocated by other socialist parties.

The Most Successful Pre-World War I Socialist Party Was the