Kingdom of Italy no relation Central Powers
The Allies, or the Entente powers, were an international military coalition of countries led by the French Third Republic, the United Kingdom of Great Britain and Ireland, the Russian Empire, the United States, the Kingdom of Italy, and the Empire of Japan against the Central Powers of the German Empire, the Austro-Hungarian Empire, the Ottoman Empire, and the Kingdom of Bulgaria during the First World War (1914–1918).
By the end of the first decade of the 20th century, the major European powers were divided between the Triple Entente and the Triple Alliance. The Triple Entente was made up of France, Britain, and Russia. The Triple Alliance was originally composed of Germany, Austria–Hungary, and Italy, but Italy remained neutral in 1914. As the war progressed, each coalition added new members. Japan joined the Entente in 1914 and, despite proclaiming its neutrality at the beginning of the war, Italy also joined the Entente in 1915. The term "Allies" became more widely used than "Entente", although France, Britain, Russia, and Italy were also referred to as the Quadruple Entente and, together with Japan, as the Quintuple Entente. The colonies administered by the countries that fought for the allies were also part of the Entente powers such as British India, French Indochina, and Japanese Korea.
The United States joined near the end of the war in 1917 (the same year in which Russia withdrew from the conflict) as an "associated power" rather than an official ally. Other "associated members" included Serbia, Belgium, Montenegro, Asir, Nejd and Hasa, Portugal, Romania, Hejaz, Panama, Cuba, Greece, China, Siam, Brazil, Armenia, Luxembourg, Guatemala, Nicaragua, Costa Rica, Haiti, Liberia, and Honduras. The treaties signed at the Paris Peace Conference recognised Great Britain, France, Italy, Japan and the United States as 'the Principal Allied and Associated Powers'.Background
When the war began in 1914, the Central Powers were opposed by the Triple Entente, formed in 1907 when the agreement between Britain and the Russian Empire complemented existing agreements between Britain, Russia, and France.
Fighting commenced when Austria invaded Serbia on 28 July 1914, purportedly in response to the assassination of Archduke Franz Ferdinand, heir to Emperor Franz Joseph I; this brought Serbia's ally Montenegro into the war on 8 August and it attacked the Austrian naval base at Cattaro, modern Kotor. At the same time, German troops carried out the Schlieffen Plan, entering neutral Belgium and Luxembourg; over 95% of Belgium was occupied but the Belgian Army held their lines on the Yser Front throughout the war. This allowed Belgium to be treated as an Ally, in contrast to Luxembourg which retained control over domestic affairs but was occupied by the German military.
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