(A) Gross Domestic Product (GDP) is your answer.
The GDP takes all the profit a country earns through export, and subtracts it from the imports that the country takes in (To see if there is a profit). It is then divided by the amount of people that lives inside the country, so that they can find the GDP per capita (How much each person is given if all the money is split evenly.) For example, the GDP per capita for the US is almost $60,000.
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There was no railroad mileage in the pacific region in 1850 because of the lack of people,they could not get their supplies to the location.
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The correct answer is:
D. Many middle class suburban woman were unhappy with their circumstances.
People in suburbia were most likely to afford cars in the 1950's.Also, most suburban neighborhoods had a lot of racial and ethnic diversity and they also lived on farms.
Maintaining economic isolation. In this quotation, Emperor Lung saw no reason to allow Europeans to import their products into a self-sufficient China which was experiencing a favorable balance of trade at the time with European nations which demanded Chinese tea, porcelain, and silk.