Creates a colored map indicating which states have the highest concentrations, 1/10,000-1/100, of people with a given surname during 1850, 1880, 1920 and 1990. If you select all years it will rotate through the four options. Track a name across the years.
Like Salisbury:
1850 – population boom in Ohio.
1880 – high 1/1000 concentrations in Michigan, Indianna, Maine, New York, Virginia, Pennsyvania
1920 – Oregan, Wisconson, Michigan, New York, Massachucetts
1990 – all over…

Only drawback is it only has the 50,000 most common last names.