- triangle shirtwaist factory fire

On March 25, 1911, the Triangle Shirtwaist Company factory in New York City burned, killing 145 workers. The deaths were largely preventable–most of the victims died as a result of neglected safety features and locked doors within the factory building. The tragedy brought widespread attention to the dangerous sweatshop conditions of factories, and led to the development of a series of laws and regulations that better protected the safety of workers.

Explanation:

during the ming dynasty

utilized the penal colony