Answer:
The black death came from fleas. Rats in China had these fleas, and they found their way to Europe. The black death spread so easily because a) there was no proper hygiene, b) cities were often crowded and animals would walk around the streets with humans, c) the 'treatments' that doctors had really didn't have anything to do with the black death. In the end, the black death ended up killing 1/3 of Europe's population and was actually one of the reasons why the feudal system ended.
Because the only way (back then) to process and make sugar farms was through manual labor. Since the Americans didn't want to put effort onto their own sugar farms, Africans were forced to do the labor part for them.
Answer:
Alexander offered peace and prosperity to cities that joined him. Many of those cities have buildings still standing from the time, some of which Alexander built. he would destroy city that withstanded him. Babylon knew they could not withstand the siege.
After World War 2, resources depleted, and so did the economy. The war had used up a lot of them, because the war lasted longer than anyone predicted. So came the Great Depression.
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