On this day:
2009: Barack Obama is sworn in as U.S. president. Obama became the country’s first black president.
1841: China cedes Hong Kong to the British during the 1st Opium War
1942: Nazi officials hold notorious “Wannsee Conference” in Berlin to organize the “final solution”, the extermination of Europe’s Jews

Born on this day:
1930: Edwin “Buzz” Aldrin, American pilot, astronaut. 2nd person to set foot on the Moon after Neil Armstrong

Gone on this day:
1993: Audrey Hepburn: Belgian/English actress, singer
1936: George V. King of the United Kingdom