The Grand Duchy of Mecklenburg-Schwerin was a territory in Northern Germany held by the House of Mecklenburg residing at Schwerin. It was a sovereign member state of the German Confederation and became a federated state of the North German Confederation and finally of the German Empire in 1871.
At the 1815 Congress of Vienna, Duke Frederick Francis joined the newly established German Confederation, and was elevated to the title of a "Grand Duke of Mecklenburg-Schwerin".
In 1867 Duke Frederick Francis II. joined the North German Confederation and the Zollverein. Prussia received valuable assistance from Grand Duke Frederick Francis II, who was an ardent advocate of German unity and held a high command in her armies. In the course of the German unification in 1871, Mecklenburg-Schwerin became states of the German Empire.
In 1918 in the course of the German Revolution the grand duchy turned into the Free State of Mecklenburg-Schwerinin, a federated state of the Weimar Republic.