Well, lets see if we can find any other differences.
Alaska 3.7
Iowa 2.3
Maine 0.8
Minnesota 4.3
North Dakota 0.8
Vermont 0.6
California 6.7
Florida 15.7
Missouri 11.5
Oklahoma 7.7
Texas 11.7
Virginia 19.9
I'm guessing this is the percentage of the state's population that is here illegally and you are trying to show a correlation between illegal immigration and murder. This is flawed logic however as all of the states in group A are closer to the border than those in B which means they will naturally have a higher percentage of illegal immigrants. Thus the inference that illegal immigrants cause higher homicide rates is absolutely baseless. Also states with smaller populations tend to have less homicide since most murders take place in large cities which is another difference between these two groups.