Describe how each of the following would affect the U. S. PPF: (a) a war that takes place on U. S. soil, (b) the discovery of a new oil field, (c) a decrease in the unemployment rate, and (d) a law that requires individuals to enter lines of work for which they are not suited.

Which factor contributed to the rise of african empires such as ghana and mali ? a. their creation and involvement in trade networks b. they focused only on agricultural production. c. they didn’t engage in warfare with other nations d. their geographic location protected them from attacks.