Final answer:
The tragedy at the Triangle Shirtwaist Company was caused by a factory fire and led to national effects. The poor safety features and locked doors prevented the workers from escaping, resulting in the death of 146 workers, mostly young women. The tragedy sparked a push for labor reforms and stricter regulations for building codes and workplace safety.
Step-by-step explanation:
The causes of the tragedy at the Triangle Shirtwaist Company were the factory fire and labor reforms. The company had poor safety features, including locked doors during work hours, which prevented the workers from escaping. As a result, when a fire broke out on March 25, 1911, 146 workers, mostly young women, died in the fire. This tragedy had national effects, leading to calls for tougher laws regulating building codes and workplace safety.