One major result of people moving from urban areas to rural areas after the fall of the Roman Empire was that s<span>tudents often traveled long distances to reach urban schools.</span>
It’s the first one “the courts that derive their power from the U.S. Constitution”
The Russian surrender did not get caused by the Americans joining, it they already surrendered and became neutral before they lost troops.
I hope this helps you and answers your question correctly. i believe the answer is the Dark Age.