1. Japan entered World War 1 on the side of the Allies in 1914. 2. Japanese forces primarily focused on capturing German colonies in the Pacific. 3. The Siege of Tsingtao in China was Japan's first major military action in the war. 4. Japanese naval power played a crucial role in securing Allied victories in the Pacific. 5. Japan's participation in the war helped to solidify its position as a major world power. 6. Japanese troops also fought in the Battle of the Somme on the Western Front. 7. The Treaty of Versailles granted Japan control over former German territories in the Pacific. 8. Japan's involvement in World War 1 laid the groundwork for its expansionist policies in the years to come.