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an illustration depicting nationalism.

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Before World War I, countries were building armies, weapons and modes of transportation such as boats and Zepplins. The more countries that got involved, the more important it became to have strong defences and attack forces.

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Nationalism is intense pride in ones country and national identity; patriotism. It can unite or divide a nation. In World War I, Serbian nationalism lead to the assassination of Franz Ferdinand, which triggered the war.

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This map shows the alliances that were formed during WW1.
The two alliances that were formed were called the Triple Alliance and the Triple Entente.

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an illustrated example of imperialism

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Europe's six major countries split to become the two sides of World War 1. Britain, France and Russia were all part of the triple Entente, and Germany, Austria-Hungary and Italy were part of the triple alliance. These alliances weren't the only countries involved in the war but they were the main cause.

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Imperialism is when a nation intends to expand its empire across other countries by gaining control over land. This was a leading cause in WWI as countries fought to expand their control across Europe.

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Militarism is the belief that a country should always be armed with strong weapons and armies, and should always be prepared to use them when needed.