What event had an enormous effect on US workplace safety? a new minimum wage the first labor union a worker strike a deadly factory fire

A deadly fire this is right on edge

Explanation:

A fire that took place in San Fransisco in a shirt factory that killed 146 people mostly women

The answer is: a deadly factory fire

Deadly factory fire could resulted in a lot of tragic results that lead to death. It can surorund the whole workplace environement in a short period of tuime and trapped the workers inside the bulding. If it get in touch with chemicals that the business use for its production, it could resulted in explosion that instantly killed every individuals near it.