What, in your opinion, was the greatest American scientific/technological accomplishment of the 20th Century? Why?

#1: I want you to assign a letter grade to the American political system, the American economy, American society, and our relations with the rest of the world, and then explain why you chose the grades that you did.

#2: What, in your opinion, was the greatest American scientific/technological accomplishment of the 20th Century? Why?

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