What was the purpose of the War Production Board (WPB)?

the purpose of War Production Board is to regulate the production and distribution of materials during the world war II in the U.S. and also in order to covert place time of industries to meet each demands of war.

herodotus taught this. herodotus was an ancient greek historian who was born in halicarnassus in the persian empire. he is known for having written the book the histories, a detailed record of his "inquiry" on the origins of the greco-persian wars.