The alliances held for the duration of the war, except for the Triple Alliance (Germany, Austria, Italy), where Italy didn't join at first and made a secret pact with France to support her. Italy then joined on the side of the Allies later on.

World War 2 changed things a lot. There were two main alliances, the Allies (mainly the Western countries and the Soviet Union) and the Axis (Germany, Italy and Japan). After the war the world split along two main power blocks, the West (NATO) and the Eastern block, with the Soviet Union at its heart.