Answer:
The stock market crash of 1929. During the 1920s the U.S. stock market underwent a historic expansion. ...
Banking panics and monetary contraction. ...
The gold standard. ...
Decreased international lending and tariffs.
Explanation:
French Chemist, Louis Pasteur, and he made the vaccine for cowpox
Answer:
Between about 300 and 900 A.D., the Maya were responsible for a number of remarkable scientific achievements–in astronomy, agriculture, engineering and communications.
Explanation:
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It probably because the president was against slavery.
Easy escape from potential threats
