In which one of the following ways did the First World War NOT impact Europe?

Which one of the following was the earlier name of Tokyo?

Which one of the following European explorer conquered Mexico?

In which one of the following cities is the Heliopolis Commonwealth War Grave Cemetery located?

Which one of the following developments took place because of the Kansas-Nebraska Act of 1854?

Which one of the following became a part of China in 1997 following the principle of 'one country, two systems'?