Tuesday marked the 20th anniversary of Ronald Reagan's "Tear Down this Wall" speech in Berlin. The speech has been argued to have focused attention on the Soviet Union and contributed to a series of events that led to the actual tearing down of the wall two years later.
It is one of the better examples of presidential oratory in the past few decades.
Here's commentary:
20 Years After "Tear Down This Wall"
Seizing the Moment
The speech itself.