History in the Moment

September 20: Costa Rica Signs Nuclear-Weapons-Ban Treaty

Published September 20, 2026

September 20, 2017: Costa Rica signed the Treaty on the Prohibition of Nuclear Weapons. Costa Rica ratified it on July 5, 2018; the treaty entered into force on January 22, 2021. Source: https://treaties.un.org/Pages/ViewDetails.aspx?src=TREATY&mtdsg_no=XXVI-9&chapter=26&clang=_en DJ Holland — History in the Moment Bridge City Entertainment Inc. • https://bridgecityent.com AI-generated narration. Original sample-free synthesized instrumental: “Quiet Moments,” week of September 14, 2026. #HistoryInTheMoment #OnThisDay #CostaRica #DiplomaticHistory #DJHolland