What two factors led to the beginning of World War II in Europe

Explanation:

These are the two factors that led to the beginning of World War II. In the years before World War II, communism gained acceptance in Soviet Russia, and this new ideology was seen as a threat by many European nations. Moreover, nationalism also became popular among many countries, and this led to the development of more aggressive and extreme fascist governments.

from the excerpt from the "the dark game" the reader can infer that folke cronholm was spying for the allied nations.