The United Kingdom began the world's first nuclear weapon…

History1940sUnited Kingdomhigh confidence

The United Kingdom began the world's first nuclear weapons research project, codenamed Tube Alloys, in 1941.

Notes on verification

Confirmed by peer-reviewed journal article, Wikipedia, and specialized defence history sources, with consistent date (August 1941) and 'world's first' characterization across independent references. [tier=silver indep_score=0.925 clusters=2 claim_tier=notable]

Sources

History of nuclear weapons (wikipedia)
https://www.tandfonline.com/doi/full/10.1080/00295450.2021.1910004 (corroboration)
https://ukdefencejournal.org.uk/britain-and-nuclear-weapons-the-second-world-war-to-the-21st-century/ (corroboration)

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