Why does Alberta Vote so Conservative

Hey Former Albertan here, I grew up in Calgary for most of my childhood but I moved to Ontario 4 years ago. Despite this Calgary will always be my home and hold a special place in my heart.

I am pretty politically involved and always found Alberta's pollical demographics very interesting. While I lived in Calgary, I never found it be overly conservative. In fact, I observed that most people were left leaning, just pro-oil.

That makes me wonder what makes so many people, especially in big urban centers like Calgary and Edmonton, vote conservative?