Bloody, long, and brutal are a few words to describe World War I. World War I was a hard fought, 4 year battle between many several countries. So, what was the main reason behind this war? There are many different underlying causes to this. Some of those reasons include alliances, militarism, and imperialism. Alliances was one of the underlying causes of this war. Alliances are agreements between countries stating that they’ll help each other in time of need. For example, as shown in document A, the United Kingdom, France, and Russia all had an alliance with each other called the “triple entente”. As you can als see in document A, the same year that these alliance agreements were arranged is the same year that WWI broke out. These alliances