When you have a partially dismantled dam on top of a mountain over a heavily populated valley, what could possibly go wrong? Well, caught up in the classism of the Industrial Revolution in America, the citizens of Johnstown can give you a prime example. 

 

Want to know more? We recommend:

The Johnstown Flood by David McCullough (Simon & Schuster; Reprint edition (January 15, 1987)

or check out The Johnstown Flood Museum (https://www.jaha.org/attractions/johnstown-flood-museum/flood-history/)