NATO is an example of an alliances that is centered around collective:

Which of the following has been the principal instrument in the expansion of national power?

A. admission of new states B. federal grants-in-aid program C. national highway system D. state colleges and universities

A telephone pollster decides to minimize costs by excluding cell phone numbers from a sample of the population being surveyed about changes in the tax law. Which group is likely to be underrepresented in this pollster's sample?

a. the elderly b. college students c. African Americans d. women