In the late 1800s, the increase of service industry workers led to the rise of the

the increase of service industry workers led to the rise of middle class, i hope this could help!

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the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.