What allied countries were known as the big four?

The "Big Four" Allied countries during World War I were the United States, the United Kingdom, France, and Italy. These nations played a significant role in shaping the post-war peace treaties and the League of Nations. Their leaders—Woodrow Wilson, David Lloyd George, Georges Clemenceau, and Vittorio Orlando—met at the Paris Peace Conference in 1919 to negotiate the terms following the war.