Canada technically got involved in WWII in 1939 two years before the USA did in 1941, but when you look at what Canada was actually doing, it was no different from what the USA was doing even 1939-1941. The primary activity of both was sending aid to Britain. So, perhaps technically true when it comes to WWII, but not substantively true. https://www.veterans.gc.ca/en/remembrance/classroom/fact-sheets/wwchronol