Most School, Other Mass Shootings Happen In US

The data don't lie.

More useful facts, here, including:
 
9. States with stricter gun control laws have fewer deaths from gun-related violence.
Last year, economist Richard Florida dove deep into the correlations between gun deaths and other kinds of social indicators. Some of what he found was, perhaps, unexpected: Higher populations, more stress, more immigrants, and more mental illness were not correlated with more deaths from gun violence. But one thing he found was, perhaps, perfectly predictable: States with tighter gun control laws appear to have fewer gun-related deaths. The disclaimer here is that correlation is not causation. But correlations can be suggestive:

“The map overlays the map of firearm deaths above with gun control restrictions by state,” explains Florida. “It highlights states which have one of three gun control restrictions in place – assault weapons’ bans, trigger locks, or safe storage requirements. Firearm deaths are significantly lower in states with stricter gun control legislation. Though the sample sizes are small, we find substantial negative correlations between firearm deaths and states that ban assault weapons (-.45), require trigger locks (-.42), and mandate safe storage requirements for guns (-.48).”