Canada was involved in the Manhattan Project.
Notes on verification
Confirmed by multiple independent, high-quality sources including Canada's own nuclear regulator, an encyclopedic source, a nonproliferation think tank, and a peer-reviewed journal article, all detailing specific contributions (uranium supply, Montreal lab, scientist involvement). [tier=gold indep_score=0.838 clusters=4 claim_tier=notable]
Sources
- History of nuclear weapons (wikipedia)
- https://www.cnsc-ccsn.gc.ca/eng/resources/fact-sheets/canadas-contribution-to-nuclear-weapons-development/ (corroboration)
- https://www.thecanadianencyclopedia.ca/en/article/canada-and-the-manhattan-project (corroboration)
- https://www.tandfonline.com/doi/full/10.1080/00295450.2021.1913033 (corroboration)
- https://isis-online.org/country-pages/canada (corroboration)