Charleston: Obama, mass shootings and gun control
Throughout his presidency Barack Obama has often had to address the US after mass shootings.
As the years passed, his calls for stricter gun control grew louder, and pushback from his opponents grew stronger.
So how did this translate into the words he used to comfort the nation after such attacks?
The BBC contrasts his language with levels of gun ownership during his terms in office.
Produced by David Botti