“The Congress of Berlin (1878) was the greatest achievement of European diplomacy between 1871 and 1914.” To what extent do you agree with this statement?

The question requires that candidates consider the merits or otherwise of the statement that the 1878 Congress of Berlin was the high point of European diplomacy. Some may focus on the Congress itself, others may compare the Congress against other events or factors that had a positive impact on European diplomacy. It could be argued that the Congress achieved the resolution of tensions over the Eastern Question avoiding conflict particularly between Russia and Austria-Hungary and avoided war in the Balkans for several decades. Alternatively, it could be argued that it stored up tensions for the future by allowing Austria control over Bosnia and Herzegovina. The hostility of Russia contributed to the establishment of the alliance system and ultimately the First World War. Some may argue that there were other greater diplomatic achievements such as the resolution of the two Moroccan crises.