Human: When was the last time the US had a food shortage? Assistant: 
The last time there was a food shortage in the US was in the Great Depression. During the Great Depression, the US experienced severe droughts, which caused farmers to lose their crops and livestock. This caused the price of food to skyrocket, which led to a number of people going hungry. In addition, the price of farm products dropped due to the droughts, which made it harder for farmers to sell their products.