As I said, you are deluded about 'knowing' half of the countries in the world.
I lived in America for over a decade before I could say that I begun to understand it. I have seen people like you who visit my home country and claim to understand it. All they do is project their faulty models onto our values and culture.
The result of my experience, which you question, is: not a single other nation would characterize the US Democratic party as “left wing”
I literally spent most of my rhetorical time abroad trying to convince folks that there was any difference at all between our two main parties.
You can scoff at me, but you will encounter this conclusion over and over again.
The world sees our two parties as beholden to corporate interests, as are centrist parties all over the globe. Money apparently makes the world go around
> The result of my experience, which you question, is: not a single other nation would characterize the US Democratic party as “left wing”
You sound like you didn't even go outside Europe.
There are two scales, nationalism-globalism, and capitalism-intervention.
Most countries have very little difference between their capitalism-intervention side, because there's only one country where someone who supports free markets and capitalism could move to, this results in the right wing of all the countries becoming purely nationalist supporting govt intervention facing globalist left wing supporting their kind of govt intervention.
For example my dad in my home country has very little opinion on capitalism/intervention scale. But on the nationalism/globalism scale he has a strong opinion. If I were to describe the economic policies of the Democratic party, he wouldn't truly form an opinion, but the moment I will start describing the social policies he would immediately understand it and call it 'the leftist party'.