Name the treaty which ended the First World war:

The Leaning Tower of Pisa is the freestanding bell tower, of the cathedral of the Italian city of Pisa. Leaning Tower of Pisa is famous worldwide for its nearly four-degree lean, the result of an unstable foundation.

There are Nine major nuclear weapons countries in the world. These countries are the US, UK, Russia, France, China, India, Pakistan, Israel, and North Korea.