Explain what roosevelt means when he says that december 7th, 1941, is "a date which will live in infamy." what central idea about the attack on pearl harbor does the description convey, and how does it convey it?

If something is 'infamous',  it means that it is well known but not for good reasons, it is famous for being bad. When Roosevelt describes Pearl Harbor this way he is saying that people are going to remember the event forever, because of how terrible it was. This description helps convey the central idea that the date of Pearl Harbor will forever be important, and it does that by mentioning its definite path to infamy. 

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