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.
The penny post was invented by the man William Dockwra. He was the one that organized and delivered mail throughout Europe for only a penny. He also introduces the postmarking to indicate when and where they had been posted. The system became so successful that the government took control of it in 1682. therefore bonding it to the post office.
The correct answer is civil disobedience
Explanation:
Although the forms of art and literature were promoted by the Shang dynasty, that Zhou family advocated technology and arithmetic. With such a centralized structure of government, the Shang clan controlled, whereas the Zhou formed autonomous colonial states, allowing individual rulers to have control instead.
