According to the CDC1, there were approximately 39,000 fatal and 67,000 non-fatal firearm injuries. in 2017. According to the CPSC2 there were approximately 7 fatal and 11,000 non-fatal injuries from firecrackers.
Meanwhile, no state absolutely prohibits the purchase of firearms (30 states permit people to carry weapons openly without any kind of permit and 41 states allow people to purchase guns without any kind of background checks) while 25 states absolutely prohibit the sale, purchase or use of firecrackers.
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