In the 1970s, the CIA worked covertly to overthrow the government of Salvador Allende, president of ________.

Which of the following statements is true of the Northwest Ordinance passed by Congress under the Articles of Confederation in 1787?

A) It declared that Native American languages are unique and should be encouraged. B) It released Native American slaves from prison. C) It granted the federal government the authority to imprison Native Americans. D) It banned Native Americans from having gambling operations. E) It stated that property would not be taken from Native Americans without their consent.

An environmental group works to pass legislation that would decrease air pollution. An individual who does not contribute to the group but nonetheless enjoys the benefits of breathing clean air illustrates the __________ problem

Fill in the blank with the correct words.