What countries did we fight against in World War 1?

In World War I, the main countries that the Allies fought against were the Central Powers, which primarily included Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria. The conflict lasted from 1914 to 1918 and involved numerous nations, but these four were the principal adversaries. The war was marked by trench warfare and significant loss of life, ultimately leading to significant geopolitical changes in Europe and beyond.