1) Who killed Archduke Franz Ferdinand and started World War One?

2) Where does the term "Dogfight" come from?

3) What did Francesco Baracca paint on the fuselage of his aircraft in 1917 that became Ferrari's logo?

4)Where did the term "Tank" come from

Bonus Question- Why did Britain keep the information, about Mexico thinking about attacking America and joining the Central Powers , from America?

Questions