The Triple Alliance was a defensive alliance between Germany, Austria-Hungary, and Italy, formed to counter the growing power of France and Russia.

The Triple Entente was a loose agreement between France, Russia, and Great Britain, formed to counter the growing power of Germany and Austria-Hungary.

Italy was a member of the Triple Alliance from 1882 to 1915, but switched sides and joined the Triple Entente in 1915.

The Dual Alliance was a defensive alliance between Germany and Austria-Hungary, formed to protect each other against Russian aggression.

The United States initially remained neutral during World War I, but joined the Allied Powers in 1917 after the sinking of the Lusitania and other German attacks on American ships.

Germany was a dominant member of the Central Powers, known for its strong military and industrial capabilities, which played a significant role in the early stages of World War I.

The Anglo-Japanese Alliance was a defensive alliance between Japan, Great Britain, and France, formed to maintain the status quo in East Asia and counter the growing influence of Russia.

The Ottoman Empire was a member of the Central Powers and controlled a vast territory that spanned parts of Europe, Asia, and Africa, making it a strategic location during World War I.

The Franco-Russian Alliance was a defensive alliance between France and Russia, formed to counter the growing power of Germany and Austria-Hungary.

Great Britain was a dominant naval power during World War I, controlling the seas and blockading enemy ports, which played a crucial role in the Allied victory.

The German-Bulgarian Alliance was a defensive alliance between Germany and Bulgaria, formed to secure Bulgaria's support in World War I.

Bulgaria was a member of the Central Powers and played a significant role in the Balkan theater of World War I, due to its strategic location and military capabilities.

The Romanian-Allied Alliance was a defensive alliance between Romania and the Allied Powers, formed to secure Romania's support in World War I.

Great Britain played a significant role in the Middle Eastern theater of World War I, securing control of key territories and engaging in military campaigns against the Ottoman Empire.

The Greek-Allied Alliance was a defensive alliance between Greece and the Allied Powers, formed to secure Greece's support in World War I.