How did Canada become more culturally public transit than the US?

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In the US for the most part people drive than take a public city bus. I read some where was some thing happen in post WW2 where in Canada and the US gone down a different path.

I read there was lot and lots of poor people in Canada and really low income in post WW2 and lots and lots of European immigration in post WW2 unlike the US that had very strong middle class at the time and less immigration. So in Canada the city was more dense and public transit where in the US more highways and people driving and this shaped the culture of the country. So Canada more opt to take city bus than the US.