Generally speaking, "assembly line jobs" did not represent an obstacle during this time, since this in fact increased productivity through the "specialization of labor".
John hay negotiate to establish open door policy with: China and the countries with spheres of influence.
At that time, john hay believe that establishing open door policy with these countries would bring economic wealth to united states. Under this policy, United states would be able to trade with china and those other countries without many restrictions such as tariff or quota. This would bring more profit to american producers.
24 October 1945 || The United Nations officially comes into existence
In 1945, representatives of 50 countries met in San Francisco at the United Nations Conference on International Organization to draw up the United Nations Charter
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It's most likely that the Mayans abandoned their cities but no one knows why
