I think the answer would be A which would be that it required all citizens to support the slave system.
Mary Bannaky was the daughter of Molly [an Englishwoman sent off to America<span> as an indentured servant at the age of 17. ... </span>Banneker<span> taught himself the </span>science<span> of astronomy; he made projections for solar and lunar eclipses and .... 16 </span>people<span> found this useful .... In </span>Technology<span> ...</span>
People buying on margins caused the stock market crash.
<u>Explanation:</u>
The prices of the stock had risen first before 1929 which made a lot of people buy the stocks but then all of a sudden the prices of the stocks started falling. This made some people buy more stocks that it would rise further while others sold off their shares. But there was more fall in the value of the stock. There fore there was a lot of sale of shares on that day making stock market crash more.
Answer:
fertile soil flooding
Explanation:
Most ancient civilizations developed alongside rivers. The main reason why is that these rivers periodically flooded the sorrounding areas, making the soil more fertile. This physical phenomenon allowed the cultivation of more and better crops, which increased the wealth and complexity of the civilization.
Examples are: Ancient Egypt and the Nile, Ancient Mesopotamia and the Tigris and the Euphrates, and Ancient China and the Yellow River.
