The Allies, Great Britain, US, France, and Soviet Union (and China) had a great defeat in the start as Germany quickly captured France in a short battle. This is were most concentration camps were held. The Allies suffered an extreme loss with this defeat of a strong ally.
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Answer:
During this period we experienced massive population growth due to the improvement of medicine. With this newfound technology more jobs were created and industrialization became the norm. New sources of entertainment became available. A whole lot of things happened but these are some of the most notable.
The Ottoman Empire. When one European power annexed a part of its crumbling power, it caused concern that they might get it all. The other European powers wanted a chance at picking it apart too.