The Presidency of Barack Obama began at noon EST on January 20, 2009, when he became the 44th President of the United States. Obama was a United States Senator from Illinois at the time of his victory over Arizona Senator John McCain in the 2008 presidential election. Barack Obama is the first African-American president of the United States, as well as the first born in Hawaii.

His policy decisions have addressed a global financial crisis and have included changes in tax policies, legislation to reform the United States health care industry, foreign policy initiatives and the phasing out of detention of prisoners at the Guantanamo Bay detention camp in Cuba. He attended the G-20 London summit and later visited U.S. troops in Iraq. On the tour of various European countries following the G-20 summit, he announced in Prague that he intended to negotiate substantial reduction in the world's nuclear arsenals, en route to their eventual extinction. In October 2009, Obama was awarded the Nobel Peace Prize for "his extraordinary efforts to strengthen international diplomacy and cooperation between peoples."

The fatal shooting of Trayvon Martin by George Zimmerman took place on February 26, 2012, in Sanford, Florida, United States. Trayvon Martin was a 17-year-old African American male who was unarmed. George Zimmerman was a 28-year-old multi-racial Hispanic American, who was the community watch coordinator for the gated community where the shooting took place.

While on a private errand, Zimmerman saw Martin walking inside the gated community where Martin and his father were visiting his father's fiancée. Zimmerman called the Sanford Police Department to report Martin's behavior as suspicious. Shortly afterwards, there was an altercation, which ended with Zimmerman fatally shooting Martin once in the chest at close range.

When police arrived on the scene Zimmerman told them that Martin had attacked him and that he had shot Martin in self-defense. Zimmerman was bleeding from the nose and two vertical lacerations on the back of his head.EMTs treated Zimmerman at the scene, after which he was taken to the Sanford Police Department. Zimmerman was detained and questioned for approximately five hours. A statement was videotaped, and he was then released without being charged. Police said that they had not found evidence to contradict his assertion of self-defense.

Barack Hussein Obama II (ⁱ/bəˈrɑːk huːˈseɪn oʊˈbɑːmə/; born August 4, 1961) is the 44th and current President of the United States. He is the first African American to hold the office. In January 2005, Obama was sworn in as a U.S. Senator in the state of Illinois. He would hold this office until November 2008, when he resigned following his victory in the 2008 presidential election.

Born in Honolulu, Hawaii, Obama is a graduate of Columbia University and Harvard Law School, where he was the president of the Harvard Law Review. He was a community organizer in Chicago before earning his law degree. He worked as a civil rights attorney in Chicago and taught constitutional law at the University of Chicago Law School from 1992 to 2004. He served three terms representing the 13th District in the Illinois Senate from 1997 to 2004.

Following an unsuccessful bid against the Democratic incumbent for a seat in the United States House of Representatives in 2000, Obama ran for the United States Senate in 2004. Several events brought him to national attention during the campaign, including his victory in the March 2004 Illinois Democratic primary for the Senate election and his keynote address at the Democratic National Convention in July 2004. He won election to the U.S. Senate in Illinois in November 2004. His presidential campaign began in February 2007, and after a close campaign in the 2008 Democratic Party presidential primaries against Hillary Rodham Clinton, he won his party's nomination. In the 2008 presidential election, he defeated Republican nominee John McCain, and was inaugurated as president on January 20, 2009. Nine months later, Obama was named the 2009 Nobel Peace Prize laureate. In April 2011, he announced that he would be running for re-election in 2012.