The African slave trade lasted until:

The flow of what river through Syria, Lebanon, Israel, and Jordan has added to the conflict between those countries?

A) Nile B) Jordan C) Tigris D) Euphrates

According to research by Jacobs and Shapiro, politicians use public opinion polls to __________

a. tell them how to vote on legislation b. determine what policies to pursue— c. identify centrist approaches to public policy d. shape their messages to the public