What historical disaster spurred laws requiring outward-swinging doors to prevent mass trapping during emergencies?

Answer

The Iroquois Theater Fire

The Iroquois Theater Fire, which resulted in the loss of over 600 lives, was a catalyst for requiring illuminated exit signs and laws mandating that doors swing outward to facilitate crowd egress.

What historical disaster spurred laws requiring outward-swinging doors to prevent mass trapping during emergencies?
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