Answer: Hope this helps!
Explanation: The word "gangsters" typically connotes criminal behaviour, violence, and disregard for the law. It implies a sense of lawlessness and moral depravity. By using this term to describe the Axis powers, Roosevelt is suggesting that their actions are not only aggressive but also immoral and criminal. He is portraying them as enemies of the entire human race, rather than just the United States.
The inflammatory language used in this passage helps convey the idea that the attack on Pearl Harbor was not just an act of war, but a treacherous and immoral act of aggression by a group of criminal aggressors. The use of strong and emotive language serves to rally support for the war effort and to justify the United States' entry into the war. The central idea conveyed is that the attack on Pearl Harbor was an unprovoked and immoral act of aggression that required a strong and resolute response from the United States and its allies.