What major global conflict occurred from 1914 to 1918?

The major global conflict that occurred from 1914 to 1918 is World War I. This war involved many of the world's great powers and was characterized by significant battles and trench warfare, causing profound changes in politics and society. It marked a pivotal moment in history, leading to the dissolution of empires, shifting national borders, and laying the groundwork for future conflicts, including World War II. Understanding this context helps to appreciate the scale and impact of World War I on the 20th century, distinguishing it clearly from the other wars mentioned, which took place in different time periods and contexts. World War II, for instance, occurred from 1939 to 1945, while the Korean War and the Vietnam War happened much later, in the mid-20th century.