How did Hurricane Maria evolve from a natural disaster into a human catastrophe in Puerto Rico? While the official death count remains at 64, a Harvard study suggests thousands were killed. While the hurricane left its devastating mark on the island, there were already destructive forces in play long before the storm made landfall. Forces that made Puerto Rico uniquely vulnerable to the ravaging effects of the storm and its aftermath. So when did the problems in Puerto Rico start? And how did they manifest in the lead up and aftermath of Hurricane Maria? Naomi Klein says that to understand what happened you need to go way back before the storm. She explains how Hurricane Maria acted as an accelerant to a process long underway and that could continue to get worse as Puerto Rico tries to pick up the pieces. Visit NBCNews.com/WhyIsThisHappening for more.