Cold War: <a href="https://en.wikipedia.org/wiki/Fall_of_the_Berlin_Wall" id="mwAYg" rel="mw:WikiLink" title="Fall of the Berlin Wall">Fall of the Berlin Wall</a>: <a href="https://en.wikipedia.org/wiki/East_Germany" id="mwAYk" rel="mw:WikiLink" title="East Germany">East Germany</a> opens <a href="https://en.wikipedia.org/wiki/Border_checkpoint" id="mwAYo" rel="mw:WikiLink" title="Border checkpoint">checkpoints</a> in the <a href="https://en.wikipedia.org/wiki/Berlin_Wall" id="mwAYs" rel="mw:WikiLink" title="Berlin Wall">Berlin Wall</a>, allowing its citizens to travel to West Berlin.