An arms race developed before 1914 as each country tried to build a larger war machine than their rivals.

Great Britain felt threatened when Germany began to construct a large navy.

European nations were increasingly suspicious and alarmed by their neighbors' military power.

These are formed when countries band together against a common threat.

A feeling of deep loyalty to one’s people and homeland.

If a nation is strong, no enemy would try to attack.

In 1914 there were two alliances - the Triple Alliance (Central Powers) and the Triple Entente (The Allies).

Great Britain, France, Russia, Germany and the United States all wanted a colonial empire.

This lead to fights about trade and who could claim what colonies.

The only way to guarantee peace is to prepare for war.