Sources used:

https://www.theguardian.com/us-news/2016/mar/15/so-america-this-is-how-you-do-gun-control

https://en.wikipedia.org/wiki/Firearms_regulation_in_the_United_Kingdom

Photo credit:

https://abcnews.go.com/US/20-years-columbine-changed-school-shootings-america/story?id=62248885

https://theconversation.com/dunblane-massacre-20-years-on-how-britain-rewrote-its-gun-laws-and-the-challenge-it-faces-now-55896

https://www.spiegel.de/international/germany/school-shooting-in-winnenden-flags-in-germany-are-flying-at-half-mast-a-612940.html

https://www.theatlantic.com/international/archive/2012/07/a-land-without-guns-how-japan-has-virtually-eliminated-shooting-deaths/260189/