Franklin Roosevelt made that statement in a speech to the US Congress on December 8, 1941, in response to the Japanese attack on Pearl Harbor the previous day. In order to confirm that he said this phrase, you can search for the text of Roosevelt's speech online. Many reputable sources provide transcripts of important historical speeches, so you could search for "Franklin Roosevelt Pearl Harbor speech" or a similar query on a search engine. It's important to refer to trustworthy sources and cross-reference multiple accounts to verify historical facts.
