What Were The Causes Of World War 2 ?
A good book on this subject is 1939 The War That Had Many Fathers. It is an even handed and objective look at how the various countries involved all contributed in their own way to the outbreak of war. There are chapters on Germany, Poland, Britain, France, Soviet Union, Italy and the USA.
www.amazon.com/1939-War-That-Many-Fathers/dp/144668623X/
A thread on this subject -
https://forum.codoh.com/viewtopic.php?f=20&t=7456