One of the main causes was the rise of the Nazi party in Germany. Other considerable causes could be issues from past wars such as WW1. The effects were from the Cold War. There was a lot to break down. Some historians did tons of work to bring you and I this knowledge that's for sure.
Hope this is the answer you were looking for and that it helps. :)
In this book, Jonathan Kozol wrote an ethnography of public schools in Chicago and its suburbs. Kozol argued that, because schools were funded by local property taxes, children in poor neighborhoods were necessarily trapped in poor schools. This system reinforces inequality. He also records the many differences between "poor" and "rich" schools," which included the difference in funding in arts and music and the number of foreign language teachers, nurses, librarians and psychologists.
