Economic failures and years of warfare, the Chernobyl disaster, perestroika glasnost and Mikhail Gorbachev all of these factors contributed to the collapse of the Soviet Union or USSR in the year 1991. Some of these incidents had a direct impact on the breaking of USSR into several countries, while others had a direct role.
This question is a good one. It has a lot to consider. That includes the advantages and disadvantages of the Industrial Revolution. Depending on the person the opinion may differ on which had more. Though society did progress by the Industrial Revolution, and it created the fast, pleasure seeking life we enjoy today. It also affected human life and even more nature. Better said the Industrial Revolution did alter humanity and nature. Whether that is bad or not we are still watching today, as the Industrial Revolution only continues .
The main purpose of the league of nations was to unify Europe and end conflicts within European countries.