The supply chain contains about 3 days worth of food. Without power there is no 1) gas for trucks 2)food in stores 3) food being produced 4) water to homes 5)li

The supply chain contains about 3 days worth of food. Without power there is no 1) gas for trucks 2)food in stores 3) food being produced 4) water to homes 5)lifesaving medical devices Many people depend on medical devices that will no longer work. All those people would die immediately. Many people depend on lifesaving drugs. They will die in the short term (e.g. insulin). Within a few months People will die from untreated water and starvation. I doubt 90% of the population will die. You can look at the siege of leningrad and see that people survived years of a siege and I think 25% died. People will find a way to survive even if it means eating bugs.