Which event triggered the start of World War I?

Which countries made up the Triple Entente during World War I?

Which weapon was commonly used in the trenches during World War I?

Which country was blamed for starting World War I?

Which event marked the end of World War I?

Which country’s sinking of the Lusitania, a British passenger ship, played a role in the United States entering World War I?

What was the name of the treaty that officially ended World War I?

Which country was NOT part of the Central Powers alliance during World War I?

What was the term used to describe the space between enemy trench systems in World War I?

Which country's alliance system was known as the Triple Alliance during World War I?