I reckon that you are right, though some would include some selected Southern European countries like Italy.
I mentioned Italy. I should have mentioned Greece but Italy is a more common destination for American travelers.
The point, however, is that 'the American left is conservative by world standards' is, to put it unkindly, a bullshit statement. It might not be bullshit if 'the world' meant northern Europe, but it's complete bullshit when the world actually means the world, including where most of the world lives.
Ask citizens in Iran, in Poland, in Libya, in China, in India, in Hungary, if America is 'conservative'.
I gave you my personal reference point: for much of northern and western Europe as well as Italy, the US is definitely not considered leftist. I would include Canada, Mexico and much of South and Central America and a lot of Africa and the Middle East in that assessment.
I am aware of Chinese, Libyan, Indian, Pakistani, and Hungarian political leanings. I mean, we're left of Kim Jong-un, and current India and Pakistani politics.
Right here on this board, by your fellow countrymen, I've been assured that America's left is hardly left at all.