You need borders for gun control laws to work (see: England, Japan, Germany, Canada, etc). Chicago has no borders.
The United States does not have a gun problem, nor a regulation issue.
What it has is an obsession with guns. They are firmly imbeded in your consitution (or at least that's how many Americans read). It's a cultural phenomenon , not much different than when extremist Muslims read "Jihad" in the Koran and abuse it to the extreme limits of what it was intended to mean.
The difference between the U.S. and the other countries you listed is that the people in those countries aren't obssessed with guns and they aren't easy to obtain and aren't readily available outside of models available to be purchased for the purpose of hunting.
The firearms that Americans have the ability to fairly easily get their hands on are designed for one use... To kill. And because many of them are illegal to hunt with, essentially they are designed to kill people.
Regulation will change nothing in America as it relates to gun, nor will secure boarders... It's woven into your cultural and legally supported by your constitution.
It would be no different than a country in which a huge segment of the populatiob smoked cigarrettes and the unfiltered type, especially... You would see a massive rise in Lung Cancer and Emphysema.... And the rest of us would look at it objectively and say "duh".
America has so much gun violence whether it be related to mass shootings, inner city violence, etc, etc, because you're obssessed with guns... That's it. Period... You can't have it both ways. If you want to read your Constitution literally (your right entirely) and flood your country with guns, you'd be utterly stupid to think that it won't result in a huge number of gun related deaths...
I watch the debate back-and-forth about regulation and I "face palm" every time.
Lose the obssession, greatly reduce the numbers availble yo the public abd down goes the violence... Or don't and that's your right (I'm certainly not trying to infringe on it) and live with the consequences... You can't have it both ways.
Europeans routinely laugh when us North Americans go over there to visit and remark at the lack of obesity and amount of fit people in their culture... They quickly point out that thry aren't obssessed with fast food and high caloric meals. They drink of all things, water, in place of soda.... Novel idea huh?