Modern history quiz online

What is the hardest knowledge question?
10 'hardest' General Knowledge Questions
What is the world's smallest country?What are the first three books of The Old Testament?How many sides does a dodecahedron have?What were the names of Henry VIII's six wives?Banksy is most associated with which city?What nationality was Charlie Chaplin?.
Question: Who sent Christopher Columbus to explore the New World? Question: What is considered the largest empire in history? Question: What year did the French Revolution start? Question: What event is commonly believed to have sparked World War I?

What is the hardest knowledge question?