Because of the weakness of non-states (ones that werent official, just groups of people who called themselves states), and European powers had strong econimies and a well organized government. Hope this was useful :P
What caused industrial psychologists to begin working with the military was <span>U.S. entry into WWI.
After years of upholding its isolationist policy of not getting involved with any wars it has nothing to do with, the US actually decided to go back on that decision and join the WWI. This is why many psychologists started working with the army in order to help the soldiers.
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476 CE this is when it collapsed
The Scopes trials was about a him teaching evolution in schools which they didnt allow back then. You can compare it with them elementary schools not allowing teachers to read "Little Red Riding Hood" in schools
