To what significant event did roosevelt refer in this excerpt? as commander in chief of the army and navy i have directed that all measures be taken for our defense. but always will our whole nation remember the character of the onslaught against us. no matter how long it may take us to overcome this premeditated invasion, the american people in their righteous might will win through to absolute victory. i believe that i interpret the will of the congress and of the people when i assert that we will not only defend ourselves to the uttermost but will make it very certain that this form of treachery shall need again endanger us. hostilities eist. there is no blinking at the fact that our people, our territory, and our interests are in grave danger. a. britain's and france's declarations of war b. u-boat attacks on an american destroyer c. germany's invasion of poland d. japan's attack on pearl harbor