What did Roosevelt mean when he said the US is an arsenal of democracy?

When Franklin D. Roosevelt referred to the U.S. as an "arsenal of democracy," he meant that America would provide critical military supplies and support to allies fighting against fascism during World War II. This phrase emphasized the nation's role in defending democratic values by producing weapons and materials necessary for the war effort. Roosevelt aimed to galvanize public support for increased production and aid, framing it as a moral obligation to protect democracy worldwide. Ultimately, it highlighted the U.S. commitment to not just its own security, but to the preservation of democratic nations facing tyranny.