American Factories Have <br />Worst Month Since 1946 U.S. industrial production <br />plunged 5.4% in March, the <br />largest drop since January 1946. The last time U.S. factories experienced a similar <br />decrease was during the shift from wartime to <br />consumer products at the end of World War II. The drop comes as many factories making autos, <br />aircraft and other goods halt production to <br />protect workers from the spread of COVID-19. Citi economists, <br />via CNN The data shows the impact of weaker demand and <br />social distancing in the workplace, according to ING <br />chief international economist James Knightley.