<a href="https://en.wikipedia.org/wiki/Cold_War" id="mwAUg" rel="mw:WikiLink" title="Cold War">Cold War</a>: At the <a href="https://en.wikipedia.org/wiki/Brandenburg_Gate" id="mwAUk" rel="mw:WikiLink" title="Brandenburg Gate">Brandenburg Gate</a>, <a href="https://en.wikipedia.org/wiki/President_of_the_United_States" id="mwAUo" rel="mw:WikiLink" title="President of the United States">U.S. President</a> <a href="https://en.wikipedia.org/wiki/Ronald_Reagan" id="mwAUs" rel="mw:WikiLink" title="Ronald Reagan">Ronald Reagan</a> publicly challenges <a href="https://en.wikipedia.org/wiki/Mikhail_Gorbachev" id="mwAUw" rel="mw:WikiLink" title="Mikhail Gorbachev">Mikhail Gorbachev</a> to <a href="https://en.wikipedia.org/wiki/Tear_down_this_wall!" id="mwAU0" rel="mw:WikiLink" title="Tear down this wall!">tear down</a> the <a href="https://en.wikipedia.org/wiki/Berlin_Wall" id="mwAU4" rel="mw:WikiLink" title="Berlin Wall">Berlin Wall</a>.