FDR let us know, in no uncertain terms, that another country had overstepped its bounds. No uncertain terms, meaning that the United States, as unprepared as it was at the time, was not about to let a foreign power attack its sovereignty without serious repercussions. It took over three years of blood, sweat, and tears before the sting of December 7, 1941 was finally erased, but it got done. There has never been another attack on US soil since. We must never let history repeat itself if we are to remain the country we are meant to be.