The homicide rate in the USA is several times the Canadian rate per 100K. If you want a more fine grained comparison then compare Vancouver BC (not USA) and Seattle.

Rates for the USA equivalent of aggravated assault are comparable with Canada.

More guns, more death, country by country, region by region.

Attempted suicide and successful suicide both correlate positively with access to firearms.

I will concede that mental issues often drive people to own a legal or illegal firearm.