Or you could look at the murder rate by state, that's fascinating as well given the dramatic difference you see between them.
Vermont, New Hampshire, Iowa, Idaho, North Dakota, Wyoming (about 8 million people between them) all have murder rates lower than Canada, Belgium and Finland.
Maine, Minnesota, South Dakota, Hawaii, Utah, Oregon, Montana, Washington all have relatively low murder rates.
I'd love to hear your explanation for what causes the wide variance between some states on murder rate.