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The Free State of Mecklenburg-Schwerin (German: Freistaat Mecklenburg-Schwerin) was a state in the Weimar Republic that was established on 14 November 1918 following the abdication of the Grand Duke of Mecklenburg-Schwerin following the German Revolution. In 1933, after the onset of Nazi rule, it was united with the smaller neighbouring Free State of Mecklenburg-Strelitz to form the Gau Mecklenburg on 31 December 1933.