April 27, 2011 - The White House releases President Obama's original birth certificate.

May 1, 2011 - In a televised press conference, Obama announces to the world that al Qaeda leader Osama bin Laden has been killed in a raid in Abbottabad, Pakistan.

May 7, 2011 - Attends ceremony to honor victims of September 11th at Ground Zero. Lays a wreath, meets with first responders, families and colleagues of the victims. He also visits the "Pride of Midtown" firehouse, Engine 54, Ladder 9, Battalion 9, the unit that lost 15 men, the most of any one firehouse.

May 25, 2011 - Is the first U.S. president to address Parliament.

October 21, 2011 - Announces the withdrawal of virtually all U.S. troops in Iraq by December 31, fulfilling a 2008 campaign pledge to end the war.

May 9, 2012 - Excerpts from an interview with ABC air in which Obama endorses same-sex marriage. He is the first U.S. president to do so. He also says the legal decision should be up to the states.

June 15, 2012 - Issues an executive order suspending the deportation of certain young undocumented immigrants who were brought to the United States as children.

September 6, 2012 - Accepts the Democratic nomination for president at Time Warner Cable Arena in Charlotte, North Carolina.

November 6, 2012 - Wins re-election as president of the United States beating Republican challenger and former governor of Massachusetts Mitt Romney.

December 19, 2012 -- Is named Time Magazine's "Person of the Year" for the second time.