In addition of the answer that was stated, also they failed to realize the audacity and ferocity of the Nazi Party and Adolf Hitler that started a new world war and large scale of exterminations for the dream future and living space. Also they failed to stop him in his genocides and large war crimes committed during the war.
Appeasement, the policy of making concessions to the dictatorial powers in order to avoid conflict, governed Anglo-French policy during the 1930s. It became indelibly associated with conservative prime Minister Neville Chamberlain
Clock? I think. I know they invented the calendar
