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How did Mecklenburg-Schwerin and Mecklenburg-Strelitz become part of the German Empire?

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Mecklenburg-Schwerin and Mecklenburg-Strelitz became part of the German Empire through a sequential process of political integration during the 19th century. Following their participation on the side of Prussia in the Seven Weeks’ War in 1866, both grand duchies joined the North German Confederation in 1867. Subsequently, they became part of the German Reich (the German Empire) in 1871.1