Germany invaded Poland on September 1st 1939
The theory that you are looking for is "the Divine right theory".
This theory claims that only certain people who were given the divine right to do so can create countries and that royalty is supposed to exist as rulers, without being questioned.
I can't give many but the main one was huge job loss and money loss, tons of company's went out of business. The death toll raised quickly. After this depression a man invented a way of preventing another one. He "buried" 1 million dollars out of the city, and told everyone. Then the city went to bug shovels to get the money, but had to be employed to buy the shovels, therefore preventing another depression and bringing employees to factorys
Continental convergent plate boundaries.
