Which war was an armed conflict involving major world powers between 1914 and 1918?

The armed conflict involving major world powers between 1914 and 1918 is known as World War I. This war was marked by significant global involvement, with major alliances formed between countries such as the Allies, including France, Russia, and the United Kingdom, versus the Central Powers, primarily consisting of Germany, Austria-Hungary, and the Ottoman Empire. The structural causes that led to the war included nationalism, militarism, imperialism, and a complex system of alliances.

In contrast, World War II occurred later, from 1939 to 1945, and involved different political dynamics and nations. The Cold War was a prolonged period of geopolitical tension between the Soviet Union and the United States, beginning after World War II and lasting several decades, while the Korean War occurred between 1950 and 1953, primarily involving North and South Korea, along with their respective allies. Therefore, World War I stands out as the conflict that matches the specified time frame and world power involvement from 1914 to 1918.