Treaty of Berlin (1878)
The Treaty of Berlin was a part of the Congress of Berlin (June 13-July 13, 1878). In it, the United Kingdom, Austria-Hungary, France, Germany, Italy, Russia and the Ottoman Empire wrote the Treaty of San Stefano.
The most important problem in the treaty was deciding what would happen to the Kingdom of Bulgaria. However, Russia insisted that Bulgaria should not be mentioned in the treaty. The Treaty of San Stefano had created a huge Bulgarian state, which was just what the United Kings and Austria-Hungary did not want since Russia would become too powerful.
The three newly-independent states soon declared themselves to be kingdoms (Romania in 1881, Serbia in 1882 and Montenegro in 1910). Austria-Hungary officially took over Bosnia in 1908, which caused a major European crisis.