It couldn’t happen here. That’s all in the past.
Most people alive don’t remember famine, war, or disease in the United States of America wiping out large swaths of US peoples. War, plagues, famines, and food shortages are things that happen across the oceans, or at least across the borders.
In 1816, Mount Tambora in Indonesia erupted pushing massive amounts of ash into the air. The global weather turned so cold that crops across the US died due to frost in June. Pennsylvania had river ice in July and August that year. Many people starved to death the next winter. Luckily, that could never happen again in the USA because Indonesia no longer has volcanos.