Step 1 : Introduction to the question "The quote "Mr. Gorbachev, tear down this wall" referred to a wall in what country?"
...The quote "Mr. Gorbachev, tear down this wall" refers to the Berlin Wall in Germany. This famous line was delivered by U.S. President Ronald Reagan during a speech at the Brandenburg Gate on June 12, 1987. The Berlin Wall, built by East Germany in 1961, symbolized the division between East and West Berlin during the Cold War, separating the communist East from the democratic West. Reagan's challenge was directed at Soviet leader Mikhail Gorbachev, urging him to take action toward ending the division and promoting greater freedom, which eventually led to the wall's fall in 1989.