As the U.S. grapples with a return to mass shootings, debates about gun legislation have once again taken center stage. Mass shootings tend to be a catalyst for these conversations, but they're actually only one part of the issue. The U.S. is a total outlier among high-income nations when it comes to gun violence in general. No other country even comes close to our gun death rates.

One of the most common arguments against gun legislation is that gun control laws simply don't work. Criminals don't follow laws, restrictions just punish responsible gun owners, etc.

We often look to other nations that have gun laws that appear to work. Comparisons between nations is tricky, though, and we don't even have to do that. We have plenty of evidence that gun laws work right here in our own country.

(I hear the "What about Chicago?!?" question echoing already—I promise, we'll get to that in a minute.)

In the U.S., most gun laws exist at the state level, so we have 50 sets of data we can examine to see how effective these laws are. The fact that there are no border checks between states muddies the waters a little bit (Chicago being a prime example—again, we'll get there in a minute), but there actually are significant differences in gun death rates between states.

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