posteritas

Latin posteritas derives from posterus ('coming after, later'), from post ('after'). The word names the people who will come after us — our descendants, the unborn, the future. It is one of the few words in any language that refers to people who do not yet exist. To write 'for posterity' is to address an audience you will never meet.

The concept shaped the American founding. The Preamble to the U.S. Constitution (1787) states that its purpose includes securing 'the Blessings of Liberty to ourselves and our Posterity.' The framers wrote a document addressed to people who would be born two hundred years later. The word posterity gave the Constitution its time horizon — not just now, but permanently.

English borrowed posterity from Old French posterite in the 1300s. The word carries an implicit moral obligation: if you act 'for posterity,' you accept responsibility for a future you will not see. The opposite — acting without regard for posterity — is one of the standard criticisms of short-term political and economic thinking.

The digital age has complicated posterity. Every email, every social media post, every photograph exists in a form that could theoretically last forever. Previous generations had to make conscious decisions about what to preserve. We preserve everything by default. Posterity will inherit not the best of us, curated, but all of us, unfiltered.