Even the US population is like 60-70% left leaning, it’s just that the left has lower voter participation rates.
Left leaning vs leftist is a much higher bar and I’d wager under 20% of the US (voting) population is leftist. That’s just based on my memory of how few leftist representatives we have in congress… Far from an exact science.
I am definitely a liberal, but I’m by no means a leftist.