Which of the following is an institutional constraint that encourages the two major political parties to operate as "big tents"?

Which individual was NOT one of the "Big Four" African Americans who shaped the civil rights struggle in the 1950s and 1960s?

A) Wiley Bishop B) Martin Luther King, Jr. C) Whitney Young D) Roy Wilkins

The acme of the Arab Spring was a revolution in _______ that overthrew its pro-American president.

Fill in the blank(s) with the appropriate word(s).