 While the Upper Silesian right bank of the Black Przemsza had been annexed by Prussia already in 1742, the land between the two tributaries was part of Congress Poland, a "de facto" protectorate of the Russian Empire according to the Final Act of the 1815 Vienna Congress.However, the spot did not become a Three Emperors' Corner until the Kingdom of Prussia merged into the newly created German Empire in 1871.It remained as such till the dissolution of all three empires in the aftermath of World War I and the establishment of the Second Polish Republic in 1918.