Canada was involved in the Manhattan Project.
Notes on verification
Confirmed by multiple independent, authoritative sources including Canada's Nuclear Safety Commission, The Canadian Encyclopedia, a peer-reviewed journal article, the Atomic Heritage Foundation, and CBC News. All corroborate Canada's role in uranium supply, refining, and research facilities (Montreal Laboratory, Chalk River) as part of the joint US-UK-Canada effort. [tier=unverified indep_score=0.328 clusters=5 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]
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://ahf.nuclearmuseum.org/ahf/location/canada/ (corroboration)
- https://www.cbc.ca/news/politics/a-relic-of-canada-s-atom-age-the-nru-reactor-is-shutting-down-for-good-1.4595836 (corroboration)