Causes/Effects of World War I

 -  Aggressive nationalism all across Europe, mainly in France and Germany.

 - Economic and imperial rivalries between the most powerful nations of Europe.

 - Militarism and the arms race between Britain and Germany.

 - Alliances being formed between European countries, the biggest being the Central - - Powers (Germany, Austria-Hungary) and the Allies (Britain, Russia, France - ----United States).