  | in 1875, the General German Worker' s Union (since 1863) and the Social Democratic Worker' s Party (since 1869) merge in Gotha to form the Socialist Worker' s Party of Germany, which is outlawed in 1878 through the Socialist law under Reichs Chancellor Otto von Bismarck
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  | in 1890 renamed the Social Democratic Party of Germany
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  | after 1912 the strongest fraction in the Reichstag
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  | in 1917 split within the SPD fraction of opponents to the war; formation of the Independent SPD (USPD), the left wing of which later merges into the KPD while the right wing rejoins the SPD
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  | in June 1933 the SPD is outlawed
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  | 1945 it is reestablished in the Western Occupation Zones
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  | 1946 in the Soviet Zones of occupation and East Berlin, forcible integration with the Communist Party of Germany to form the SED (Socialist Unity Party of Germany)
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  | in West Germany, the SPD is permanently characterized by its Chairman Kurt Schumacher
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  | 1959 Godesberger Party Program: deletion of all Marxist elements from the party program and support for the social market economy
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  | development into a people’s party
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  | 1989 new basic program (the Berlin Program): calls for greater social justice and an ecological reconstruction of industrial society
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  | 1990 reunification with the SPD of the DDR (which is reconstituted in 1989) |