Through its ability to provoke anger and even outrage at social injustice and human atrocities, photography can be a powerful force. Ever since its invention in the 19th century, the medium has contributed to the instigation of great global movements and massive societal change. Take a look at this selection of 19 images which, in their own way, had an impact on the world – sometimes profound, sometimes less so.
19. Olive Oatman’s tribal tattoo
As they traveled across Arizona in 1851, 14-year-old Olive Oatman and her family were attacked by Native Americans thought to have been members of a Tolkepaya tribe. Her parents and four of her siblings were killed outright. One brother escaped while she and her younger sister were taken into captivity. The sister unfortunately died, but Olive was sold on to some Mohave people as a slave. Thankfully, the young woman was freed in 1856 – but not without the experience leaving its mark. It is fair to say that her Mohave tattoos thoroughly shocked white American society.