Based on this graph, national debt reached the highest percentage of GDP ______.

The normal rate of return is the

A) average rate of return earned in an industry at a given point in time. B) opportunity cost of capital. C) return on capital associated with zero accounting profits. D) the amount paid to an investor when the firm is an on-going concern.

Which of the following statements about population and migration is most accurate?

a. In the first decade after the Civil War many of the freedmen moved to the North. b. During most of US history more African Americans have lived in rural than urban areas. c. Latinos are expected to comprise a smaller fraction of US population in 2025 than they do now. d. Between 1810-1850 the population center of the US shifted from the Midwest to the east.