What were Harry S. Truman's most important contributions? Which of his decisions had the greatest effect on history?

Which best describes alexis de tocqueville

How did industrial production improvements impact export-dependent areas of the world during the great depression?   a.  demand for certain raw materials rose.      b.  demand for certain raw materials fell.      c.  the new technology was exported to most raw material producing nations.      d.  there was a decrease in tariffs.

How do private property rights serve as an incentive in a free enterprise economy ?