Modern & Postmodern Periods By kaitlyn.thompson Jun 1, 1967 Beatles The Beatles release Sgt. Pepper's Lonely Hearts Club Band. Apr 27, 1994 Nelson Mandela Nelson Mandela elected president. Sep 11, 2001 9/11 Hijacked planes crash into the World Trade Center in New York, the Pentagon in Washington, D.C. and a field in rural Pennsylvania. Thousands of lives are lost. Dec 26, 2004 Tsunami Strikes Tsunami devastates Southeast Asia. Nov 9, 2012 Germany Berlin Wall torn down reunification of East and West Germany follows.