The international system as we know it developed in __________

To prevent the spread of the Standard Oil Company's monopoly into Texas, the state's attorney general in 1889 began to file "antitrust" suits against companies affiliated with Standard Oil

This suspicion of a major corporation is an expression of a. the Populist tradition in state politics. b. the state's laissez faire culture. c. the power of the Republican Party. d. the state's cowboy culture. e. the power of the national government.

Selection is a threat to the internal validity of which of the following designs?

a. Nonequivalent comparison group design b. Interrupted time-series design c. Regression-discontinuity design d. All of the above