Hirsch and fellow professors Joseph Kett and James Trefil provide a 64-page Appendix, "What Literate Americans Know". This consists of words, names, and phrases of all kinds. It might be sobering to learn how much or how little of this list is recognized by high-school students; university students, bureaucrats enforcing regulations; Congressmen writing laws. Note that this is not a sealed, official list; nor are students or citizens expected to be able to write a thesis on any of these. But they should recognize and understand these terms when they are read or heard.
Hirsch created a list of words that we should know to be considered "culturally literate." Example terms provided here.