What does the average American look like? As time goes on, this question is increasingly difficult to answer.

Renowned photographer Martin Schoeller captured the Americas melting pot perfectly, for the October 125th anniversary issue of National Geographic magazine. You can see a series of faces which become less homogeneous and more diverse.

The portraits come with the individual’s 'self ID' and the box he or she checked to indicate race as specified on the 2000 and 2010 census - a powerful reminder of Americans’ complex cultural and racial origins.

The full 'The Changing Face of America' gallery can be viewed here: http://ngm.nationalgeographic.com/2013/10/changing-faces/schoeller-photography