It is difficult to identify a specific point on which all European powers have universally agreed, as there have been numerous disagreements and conflicts throughout history. However, there have been instances where European powers have come to agreements on specific matters. One such example is the Treaty of Versailles signed in 1919, which marked the end of World War I and detailed the terms of peace among European powers.
One point on which all European powers agreed was the Berlin Conference of 1884-1885. This conference was called by the German Chancellor Otto von Bismarck and aimed to establish guidelines for the colonization of Africa. The major European powers, including Germany, Great Britain, France, Portugal, Belgium, and Italy, agreed to respect each other's territorial claims in Africa and divide the continent among themselves. The conference also established some general principles, such as free trade along the Congo and Niger rivers and the principle of effective occupation.
