What is the object or activity that is most often cited for impacting air quality?

Which economy came closest to a pure market economy?

a. Seventeenth-century France b. Eighteenth-century Britain c. Nineteenth-century United States d. Twentieth-century Vietnam

Before the ratification of the Constitution, the United States was organized as a(n) __________

a. confederation b. direct democracy c. oligarchy – d. conglomeration