As Nazi Germany threatened war in Europe, Britain made efforts to strengthen ties with the United States, which included hosting one of the largest foreign pavilions at the 1939 New York World’s Fair. The pavilion’s centerpiece was Lincoln Cathedral’s Magna Carta, making its first appearance outside of Britain. ... When the United States entered World War II in December 1941, the Library evacuated Magna Carta, the Declaration, the Constitution, and other cherished treasures from its collections to Fort Knox, Kentucky.