Alliances helped cause World War I because the triple entente alarmed Germany, and she felt surrounded by the alliance; this made a worried, uneasy atmosphere. For example when Britain joined the triple entente and France and Russia formed an alliance against Germany, she was fearful and wanted to be ready for an attack, so Germany started building up her empire and Navy. I think this is a valid reason for triggering World War I because each country wanted to be one step ahead of the other, and there is always an end to that, in this case-it was war. Militarism has and alliances are linked because when Germany built up her empire and Navy, she also developed her Militarism.
Another cause was imperialism. European nations ruled smaller countries called colonies, and