1. Which event triggered the outbreak of World War I?

2. Which countries were the central powers during World War I?

3. Which countries were the allied powers during World War I?

4. When did World War I begin?

5. Which battle is known as the turning point of World War I?

6. Which country was forced to take sole responsibility for World War I under the Treaty of Versailles?

7. Which weapon was commonly used during World War I and had a significant impact on trench warfare?

8. Who was the leader of Germany during World War I?

9. Which country was neutral during World War I?

10. Which ocean did the naval battles primarily take place in during World War I?

11. Which famous ship was sunk by a German U-boat, leading to the United States joining World War I?

12. Which country withdrew from World War I in 1917 due to the Russian Revolution?

13. Which treaty officially ended World War I?

14. What was the immediate cause of the United States entering World War I?

15. Who was the President of the United States during World War I?

16. Which battle is known for the extensive use of poisonous gas during World War I?

17. Which country experienced a revolution in 1917 and eventually withdrew from World War I?

18. Which empire dissolved as a result of World War I?

19. What was the main goal of the League of Nations, established after World War I?

20. Which event marked the official end of World War I?