Although World War 1 is sometimes said to have been caused by the assassination of Archduke Franz Ferdinand of Austria in June 1914 by a Yugoslav nationalist, that particular event was just a trigger.  When looking back at these events and their respective dates, it isn't hard to see that a war was on the horizon, and that if it erupted, it was going to be a major war, because nationalism and alliances were so entrenched in the way the most powerful nations were operating at that time.  In order, here are the items you inquired about, plus the dates for World War 1, also known as the Great War.

Russo-Turkish War, 1877-1878

Congress of Berlin, 1878

Russo-Japanese War, 1904-1905

First Balkan War, 1912-1913

Second Balkan War, 1913

World War 1, 1914-1918