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The map that is given gives you a hint to what the answer is. On the legend it states the hint, "people per km²". This tells us that the map shows the population density in South America. A population density map shows which areas have the most people to least people.
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The name of the large arc of farmland that includes Mesopotamia is the "Fertile Crescent," since this area was especially fertile and highly conducive to crop growth.
They are taxes on goods that are imported into a country. A government may use the money from them to fund government operations.
The constitution. The Supreme Court was originally made to rule on the constitutionality of decisions made by state courts