Yup. 90% maybe high but it will be above 50%.
Think Puerto Rico with 300,000,000 people. Grocery stores would be empty within a week if not earlier. There would be a shortage of potable water. City dwellers would be stranded, chaos would ensue.
Many people do not realize things do not happen without electricity. I am in the food industry and inventories are controlled to create efficiencies, not create a safety net for society.
You're right...but worse than Puerto Rico THERE WILL BE NO FIRST RESPONDERS OR AIR LIFT PALLETS OF FOOD AND WATER. NO BAIL OUT - NO HELP - NO GENERATORS... EVER.