As the American Library Association (ALA) celebrates 150 years, we’re drawing inspiration from key events since its 1876 founding: from the first conventions and library schools, through wartime and the fight for civil rights, to seismic technological advancements and the existential threats of the current moment. Though not a comprehensive timeline of library history, the milestones collected here demonstrate lasting impact and how libraries and the profession are intertwined with the American story itself—as repositories of memory, arenas of debate, and enduring instruments of democratic life.