Why? It surely wasn't because of strict firearm laws. My replica of the 1902 Sears mail-order catalog shows 35 pages of firearm advertisements. People just sent in their money, and a firearm was shipped.

 

Dr. John Lott, author of More Guns, Less Crime, reports that until the 1960s, some New York City public high schools had shooting clubs where students competed in citywide shooting contests for university scholarships. They carried their rifles to school on the subways and, upon arrival, turned them over to their homeroom teacher or the gym coach and retrieved their rifles after school for target practice.