Where were the entire Constitution and Declaration of Independence of the US stored during World War II?

In December 1941 the Library of Congress sent the Declaration and Constitution to the bullion depository at Fort Knox, Kentucky, for safekeeping. By September 1944 it was decided to return the documents to their permanent exhibit at the shrine in the Library of Congress. The new Archivist of the United States, Solon Buck, had no intention of pressing for their transfer to the National Archives. At one point he noted that the documents had been copiously cited in numerous scholarly works as being in the Library of Congress, and in case of their transfer, all those citations would be obsolete.

Fort Knox is a United States Army installation in Kentucky, south of Louisville and north of Elizabethtown. It is adjacent to the United States Bullion Depository, which is used to house a large portion of the United States' official gold reserves. The 109,000 acres (170 sq mi (441 km2)) base covers parts of Bullitt, Hardin and Meade counties. It currently holds the Army Human Resources Center of Excellence, including the Army Human Resources Command. It is named in honor of Henry Knox, Chief of Artillery in the American Revolutionary War and the first United States Secretary of War.

For 60 years, Fort Knox was the home of the U.S. Army Armor Center and the U.S. Army Armor School, and was used by both the Army and the Marine Corps to train crews on the American tanks of the day; the last was the M1 Abrams main battle tank.