why was the Congress of Berlin started?

The Congress of Berlin was started in 1878 to address the aftermath of the Russo-Turkish War (1877-1878) and the resulting territorial changes in the Balkans. The aim of the Congress was to redraw the map of Eastern Europe and settle disputes between various powers concerning their influence and territorial control in the region. The Congress was called by the German Chancellor Otto von Bismarck and brought together representatives from major European powers, including Britain, Russia, Austria-Hungary, Italy, and France, as well as the Ottoman Empire, to negotiate the terms of peace and establish a new order in the Balkans. The Congress resulted in the Treaty of Berlin, which formalized the territorial changes and established new borders and spheres of influence among the powers involved.