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).
Sources
- History of nuclear weapons (en.wikipedia.org)
- https://www.cnsc-ccsn.gc.ca/eng/resources/fact-sheets/canadas-contribution-to-nuclear-weapons-development/ (cnsc-ccsn.gc.ca)
- https://www.thecanadianencyclopedia.ca/en/article/canada-and-the-manhattan-project (thecanadianencyclopedia.ca)
- https://www.tandfonline.com/doi/full/10.1080/00295450.2021.1913033 (tandfonline.com)
- https://isis-online.org/country-pages/canada (isis-online.org)