Pete Souza has been the Chief Offical White House Photographer during Barack Obama's two terms as President. This week, Obama will visit South Dakota, meaning he's visited all 50. To mark the occasion, Souza has selected his favourite photo from each state he's stepped foot in with Obama.

Souza has clearly earned his title. His photos are brilliant. I've selected my favourites below. You can view them all here.

Arizona, 2009

California, 2014

Florida, 2015

Georgia, 2013

Hawaii, 2012

Maine, 2010

Michigan, 2012

Minnesota, 2014

Nevada, 2012

New Hampshire, 2012

Oklahoma, 2013

Oregon, 2012

South Carolina, 2015

Wisconsin, 2010