Question Asked By Oregon's Attorney Defending Measure 114

How many mass murders were there before 1960?  What went into the Supplemental Declaration:

How do you kill lots of people without modern firearms technology?  Before 1960, there are four incidents with more than 50 dead.  Colfax, Louisiana (1873) where the KKK murdered 150 black civil rights activists using firearms; Mountain Meadows, Utah (1857) where Mormons with firearms of type unknown murdered 140 settlers moving west; Tulsa, Okla. (1921), at least 89 murdered by a mob, with a variety of weapons, Calumet, Mich. (1913) where one person provoked a panic that killed 74 people, mostly trampled to death.

By comparison, my database, while incomplete after 1960, has six mass murders with more than 50 dead after 1960: San Juan, P.R. (1986), 97, dead by arson committed by three men; New York City (1990), 87 dead by arson by one person; Oklahoma City (1995), 168, dead by explosive committed by two (only one was given a capital sentence); New York City (2001), 3047, dead by aircraft, and Arlington, Va. (2001), 184, dead by aircraft with 19 murderers from both events; Las Vegas (2017), 58, dead by one rifleman.