https://www.marketwatch.com/story/why-the-gun-industry-misses-obama-2019-05-07https://ammo.com/articles/obama-greatest-gun-salesman-in-america-infographic https://www.pewsocialtrends.org/2017/06/22/americas-complex-relationship-with-guns/ https://www.statista.com/topics/1287/firearms-in-the-us/