Step 1 : Introduction to the question "Which famous line is associated with former President Ronald Reagan?"
...Ronald Wilson Reagan was an American politician and actor who served as the 40th President of the United States from 1981 to 1989. Prior to the presidency, he had a three-decade career as a Hollywood actor and union leader before serving as the 33rd Governor of California from 1967 to 1975.
Step 2 : Answer to the question "Which famous line is associated with former President Ronald Reagan?"
"Tear down this wall!":
"Tear down this wall!" is a line from a speech made by US President Ronald Reagan in West Berlin on June 12, 1987, calling for the leader of the Soviet Union, Mikhail Gorbachev, to open up the barrier which had divided West and East Berlin since 1961. This speech by President Ronald Reagan to the people of West Berlin contained one of the most memorable lines spoken during his presidency. Two years later, the barrier came down, to the delight of East and West Berliners alike. The two Germanys were officially reunited on Oct. 3, 1990.