This is an inchoate line of argument. You ask for precedent and then object to it being in the past.
WWII was the last time America was attacked by a foreign state. Ukraine is being attacked by a foreign state. The analogy shouldn’t be lofty enough to go over one’s head. If Russia rolls tanks into the Baltics we’ll have a new analogy for the ensuing half century. For the time being, I’m fine letting the precedent age.
Please do not try and take an immensely complex topic and boil it down to the point it has no meaning.
Yes, the Soviets defeated the Nazi's with some distraction, tech and assistance from the Allies. China did a whole ton of work against Japan, they fought the longest and hardest.
Also, without the Marshall Plan (of which the Soviets were fearful of and denied themselves participation), Europe would not be Europe right now. Maybe Russia wouldn't be an economic wasteland today, forcing their gangster gov't to use an invasion of a sovereign country to prop up their oligarchy.
Don’t worry about our level of education. We’re fine, thanks.
Which Americans did. In World War II.
With donations, war bonds and by accepting massive sacrifices to their quality of life through rations, price controls and more. We did this when we felt threatened. Last I checked, the Canadians weren’t rolling tanks into Syracuse.