There are huge differences in these numbers in the US based on race, as well, which most people do not factor. This really reflects culture, or subculture, rather than race, but it is definitely worth discussing.
Critiques of A Tale of Two Cities (a study by Kellerman, a gun control advocate at the CDC) is definitely worth reading. He compared Vancouver and Seattle crime rates back in the 80s and came to the conclusion that Vancouver's stricter gun control as compared to Seattle explained Vancouver's lower murder rates. The researcher's conclusion was that the risk of murder in Seattle was "explained by a 4.8-fold higher risk of being murdered with a handgun in Seattle. We conclude that restricting access to handguns may reduce the rate of homicide in a community." In other words, guns were the culprit.
In order to come to that conclusion, the researchers ignored race. They glossed over the disparate ethnic compositions of Seattle (12.1% Black and Hispanic; 7.4% Asian) and Vancouver (0.8% Black and Hispanic; 22.1% Asian). The importance? Despite typically higher prevalence of legal gun ownership amongst non-Hispanic-Caucasians in the US, the homicide rate was lower for non-Hispanic-Caucasian Seattle residents (6.2 per 100,000) than for those in adjacent Vancouver, Canada (6.4). Only because the Seattle Black (36.6) and Hispanic (26.9) homicide rates were astronomic could the authors make their claim.
In other words, the homicide rate for whites during the study period was actually higher in Vancouver, the city in Canada with stricter gun control.
Here is an interesting chart for you.
http://www.guncite.com/CDCStats/us9794_fhomi.htmThe data is a little old now (90s), but it illustrates the point.
The murder rate among
white males, aged 20 to 24 (the highest murder age range), is 11.82 per 100,000.
This is almost twice the national average for all ages and races.
According to the same chart:
The murder rate among black males, aged 20 to 24, is 133.34 per 100,000.
Thankfully, both of these rates are lower now, almost 20 years later, in spite of the presence of tens of millions more guns in private hands in the United States during that period of time, but they go to show that you cannot ignore cultural factors.
The US is a violent culture in general, and certain subcultures are extremely violent, equivalent to or more so than third world countries.