Which archduke's assassination sparked World War I?

In which city was Franz Ferdinand assassinated?

What was the alliance of Germany, Austria-Hungary, and the Ottoman Empire called?

What is November 11, 1918, called in many countries?

What year did the United States enter World War I?

Which gas was famously used as a weapon in World War I?

Which French palace hosted the treaty that ended World War I?

The Zimmermann Telegram asked which country to attack the United States?

What defensive structures became the symbol of World War I's Western Front?

Which armored vehicle debuted at the Battle of the Somme?