The ones I recall from Jr-Sr High English classes are The Pearl, Merchant of Venice, Macbeth, The Great Gatsby, The Grapes of Wrath, A Farewell to Arms, Of Mice and Men, For Whom the Bell Tolls, The Crucible, and The Jungle. I am probably forgetting more than I am remembering!
There are some (Cannery Row, Brave New World, 1984, Fahrenheit 451, Lord of the Flies, Catcher in the Rye, To Kill a Mockingbird, Animal Farm…), that I can’t recall if we were required to read them, or I just did so on my own.
In addition, a US History course had us read a number of paperbacks instead of a textbook. I know these included FDR and the New Deal, Only Yesterday, and Fire in the Lake. The other titles are not coming to me right now.