FBI UCR data.

1995-2014: https://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2014/crime-in-the-u.s.-2014/tables/table-1

1900-1999: https://en.wikipedia.org/wiki/List_of_countries_by_intentional_homicide_rate_to_1999


The FBI has made it impossible to get pre-1960 data from their web site, but copies of it exist from years previous when it was available. Other crimes can't be mapped back because the definitions changed (assault in 1960 wasn't the same as assault in 1930), but murder is murder and it's definition has stayed unchanged since 1900. The Wikipedia page is built from those FBI numbers, as confirmed by viewing a number of papers and books written with the data.

Last edited by Calhoun; 10/08/15.
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