How did the gross national product (gnp) of the United stated change between 1940 and 1944

when the U. S. joined the war effort, drastic changes began to take effect. The United States quickly converted its struggling civilian economy into the most productive. The period between 1940 - 1944 saw the greatest expansion of industrial. Measured in 1939 constant dollars, the Gross National Product of the United.

Gross National Product of the US changed dramatically between 1940 and 1944 since this was the time the US was involved in World War II, which greatly increased domestic production that created more jobs--lasting well into the decades following the end of the war.