They do show supportive evidence of some gun laws having a meaningful effect on violent crime, so I'm not sure what they're referring to. For instance, it appears that child access prevention laws, specifically, are associated with a significant reduction in firearm homicides.[2]
RAND does complain that there is insufficient or limited evidence in a lot of areas though, like effect on mass shootings.
[1] https://www.rand.org/research/gun-policy/key-findings/what-s...
[2] https://www.rand.org/research/gun-policy/analysis/child-acce...
https://en.wikipedia.org/wiki/List_of_mass_shootings_in_the_...
Half the definitions at https://en.wikipedia.org/wiki/List_of_mass_shootings_in_the_... don't even exclude gang violence, drug violence, or organized crime. Statistically if you're not involved with gangs or drugs, you're not going to be involved in a gang or drug related shooting. The majority of those killed or injured are at least peripherally involved. So you should immediately question to credibility and motived of any organization that wants to talk about "mass shootings" which by definition are scary because they're random and unprovoked but then want to include a huge number of incidents are driven by crime, drugs, and gangs, none of which is random or unprovoked.
The US being "50 countries" was sort of the original idea, but over time things changed significantly. Many aspects of life are controlled federally and have been for almost a 100 years. Yes, there is also state government but there is nothing special about that: many countries have some type of sub-national government with varying degrees of power. In the US state governments tend to have more power than average, but that does not make it "50 countries".
Everything is stuck in a weird dysfunctional limbo where none of the major institutions work as was intended at all. Endless discussion and navel-gazing over what some comma could perhaps have meant 250 years ago is not a serious way to govern a country.
Not even half.
Canada is slightly larger, plus there's Mexico and a bunch of smaller countries, which share the North American continent with the USA.
If your states were like real countries, they could just ban guns, set up border controls, and turn away anyone bringing guns in. But they can’t, so they’re not countries.
Plenty of countries have states with distinct laws and cultures. Canada, Brazil, England, Italy, etc. That doesn’t mean those states are countries.
Sounds like you’re letting US exceptionalism cloud your judgement.