Why did earlier historians consider the Medieval Period the Dark Ages

How was classical persia's extensive network of roads important to its civilization?

This essay was published in 1788 in response to an article that argued against the ratification of the u.s. constitution. he tells you that the president will have more power than many in princes in according to the essay, what is the effect of dividing control of the military power of the united states between congress and the president?

People who move from place to place for survival is called