1. The Triple Alliance (1882): This alliance was formed between Germany, Austria-Hungary and Italy. It was created as a defensive alliance to protect each other in the event of an attack or war. This alliance was instrumental in the lead-up to World War 1, as it created an implicit understanding between the three countries and helped to build an alliance against the Triple Entente (Russia, France, and Britain). Although the alliance was not directly responsible for the war, it did create a balance of power between the two sides and, as a result, made the outbreak of war more likely.
2. The Triple Entente (1907): This alliance was formed between Russia, France, and Britain. It was created as a response to the Triple Alliance, as the three countries wanted to balance the power in Europe. This alliance was essential to the outbreak of World War 1, as it increased the tensions between the two sides and created a sense of competition. Additionally, the alliance provided a sense of solidarity amongst the members and allowed them to act in concert in the event of war.
3. The Anglo-Russian Entente (1907): This alliance was formed between Britain and Russia. It was created in order to resolve the tensions between the two countries, which had become increasingly strained since the Russo-Japanese war. This alliance was important for World War 1, as it created a strong relationship between the two countries and allowed them to act together in the event of war. Additionally, it helped to increase the tensions between the two sides and made the outbreak of war more likely.