Final answer:
The automobile industry shifted its production from cars to tanks and planes during World War I and II to support the war efforts and meet the demands of the armed forces.
Step-by-step explanation:
The automobile industry went from making cars to producing tanks and planes during World War I and World War II.
During World War I, automobile plants were retooled to manufacture tanks and armored vehicles, while in World War II, factories shifted their production to tanks, ships, aircraft, and trucks to meet the demands of the armed forces.
This transition in the automobile industry played a crucial role in supporting the war efforts and providing the necessary military equipment.