President Barack Obama, visiting Watertown, South Dakota, on Friday, May 8, shows off a note given to him by 11-year-old Rebecca Kelley. Rebecca had written him a letter asking him to visit South Dakota, which is the 50th state Obama has visited during his time in office. White House photographer Pete Souza highlights a picture from each state.
Marching at the 50th anniversary of Bloody Sunday in Selma, Alabama, on March 7, 2015.
Air Force One refueling at Elmendorf Air Force Base near Anchorage, Alaska, on November 12, 2009.
Viewing the Grand Canyon in Arizona on August 16, 2009.
Touring tornado damage in Vilonia, Ar