 Complete the following phrase:  Before the First World War the Social Democratic Party SPD was the largest party in Germany and the worlds most successful socialist party. Although still officially claiming to be a Marxist party, by 1914 it had become in practice a reformist party. In 1914 the SPD members of the Reichstag voted in favour of the war. Left-wing members of the party, led by Karl Liebknecht and Rosa Luxemburg, strongly opposed the war, and the SPD soon suffered a split, with the leftists forming the Independent Social Democratic Party of Germany USPD and the more radical Spartacist League. In November 1918, 