A 1951 paper convinced philosophers the analytic/synthetic divide might not exist

Philosophers had long split statements into 'analytic' truths (true by definition, like 'bachelors are unmarried') and 'synthetic' truths (true by fact). W. V. O. Quine argued the distinction quietly collapses under scrutiny — no statement is truly immune from revision if enough of our other beliefs change around it.

— W. V. O. Quine, Two Dogmas of Empiricism — The Philosophical Review, 1951