I'm not sure city size is specifically the difference. The U.S. does have large cities, but the citizen-violence and police-violence problems aren't limited to

I'm not sure city size is specifically the difference. The U.S. does have large cities, but the citizen-violence and police-violence problems aren't limited to those. For example, none of these states have any cities as big as Vienna (2.5 million), yet they are among the more dangerous states: Mississippi, New Mexico, South Carolina, Alabama, Indiana.