What is the name given to the dramatic change in economies and cultures brought about by the use of achines to do work formerly done my hand

Why was the battle of gaugamela an important turning point in alexanders conquest of persians empire

Examine these two paintings that depict famous events from american history. the image on the left, painted in 1940, shows the signing of the u. s. constitution in 1787. the image on the right, painted in 1836, shows the american victory at the battle of yorktown in 1781.which of these paintings should be considered a secondary source?

What was the underlying cause of the cold war?