According to Roger Waldinger, the achievement of social mobility by immigrant groups results from ____________.

A high degree of experimental control may increase internal validity but often reduces

A) scientific rigor. B) construct validity. C) believability. D) external validity.

The Framers changed their mind about granting Congress the power to "make war" (instead granting Congress the power to "declare war") for what reason?

a. in order to enable the executive branch to defend the nation if attacked when Congress was not in session b. so that Congress and the executive branch would have to work together should a war occur c. in order to establish the supremacy of the executive branch d. in order to separate the power of Congress from the power of the executive branch e. All of the above