At the end of 1940, President Franklin D. Roosevelt delivered a powerful "fireside chat," a fitting backdrop to the visit to Europe this week by his successor, George W. Bush. In his radio address, Roosevelt summoned a reluctant America to sacrifice to produce the arms urgently needed by freedom-loving people in Britain and elsewhere at risk of being overrun by Nazism and other forms of tyranny. He called the United States "the great arsenal of democracy." In his travels, Mr. Bush will meet with leaders of a number of countries whose national survival in World War II depended critically upon...