Most 18th century Americans lived in self-sustaining rural communities. The Industrial Revolution witnessed the evolution of large urban centers, such as Boston and New York City, and spurred a massive internal migration of workers. The Industrial Revolution also stimulated the rise of unskilled labor.
It was just one of the MANY reasons that resulted in the 2nd WW. Maybe if they hadn't been so harsh towards Germany and blamed them for the cause of WW1 then the 2nd one most likely wouldn't have happened.
