[5C] The Building / Immigration Analysis
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Company signs on the Triangle Building are visible in both "Fire Fighters" ("Clothing Specialists," "Men's Clothing," "Harris Bros." and "Suits" are amongst the more legible) as well as "Triangle Shirtwaist Factory Building", in which "Triangle Waist Company" can just be read on the uppermost sign.
Clothing manufacture was a huge and growing industry at the turn of the century - the shirtwaist industry employed over 230,000 workers in 500 factories in New York State alone. The bulk of the workers in the clothing industry were recent amd first-generation migrants, as discussed elsewhere. Of those migrants, three quarters were Jews, and in fact six out of ten working Jews were employed in clothing production.