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The Government raised money to help the war by selling Liberty Bonds. They raised around $17 billion. Although they had to repay the money after the war (victory bonds).
More information:
What were Liberty Bonds?
They were used to raise money only for WW1.
How did it help others?
They wanted Americans to feel they were making valuable choices to help the war. The Bonds were commonly advertised when WW1 was taken place.
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They spread knowledge of medicine, mathematics, and other sciences. The hindu-arabic mathematical numerals 0-9 is still used today.
A. Government provides services that would not be practical for private business
Answer: D. it lies in a valley, surrounded by mountains, that traps in air pollutants over the city.
Explanation: Being in a valley results in air pollution being contained to an area.