Realists argue that military force and economic force are the only two instruments of international politics that really matter

Researchers cannot observe behaviors of interest continuously because it would be too costly

As a result, they create blocks of time to study the behaviors and hope that the behavior in those blocks presents an accurate picture of what happens during non-observation times. Researchers have investigated optimal ways of using sampling blocks in observational research. How accurate are conclusions drawn from small, medium, and large samples of observations and with random versus cluster sampling? What will be an ideal response?

The Soviet Union collapsed in ______.

a. 1989 b. 1990 c. 1991 d. 1992