networks of trenches to protect themselves from enemy fire. These trenches stretched across the Western Front in Europe and resulted in a prolonged and grueling conflict. 2. **Major Battles:** Nota

nst the U.S. American involvement had a significant impact on the outcome of the war. 6. **Russian Revolution:** In 1917, the Russian Revolution led to the overthrow of the Russian monarchy and the rise of the Bolsheviks. Russia subsequently withdrew from the war due to internal turmoil. 7. **End of the War:** The war ended on November 11, 1918, with an armistice agreement. The Treaty of Versailles, signed in 1919, officially ended the state of war between the Allied Powers and Germany. This treaty imposed harsh terms on Germany and set the stage for geopolitical tensions in the years that followed. 8. **Casualties:** World