First there was Yellow Fever vaccine! The there was DDT which eradicated small pox, penicillin and the sulfa drugs.
Let's not forget the "Green Revolution" and Neal Armstrong's message from the moon. Oh yeah! we are such a horrible society. We fought three major wars in the 20th Century to bring freedom and individual rights to mankind which, BTW ended the Colonial Era, (a fact that France has never forgiven us!). We founded the League of Nations, (which failed), and the United Nations, (which failed).
Yup! There's nothing positive from all our efforts!
To quote one of our prescient Senator's from the pages of Rolling Stone: "Fk'em"
The United States never joined the League.
"The there was DDT which eradicated small pox"
No. DDT eradicated mosquito breeding grounds, and by transitivity, malaria.