This is not true, and keeps getting brought up as if it were.

The rest of the developed world has _universal_ healthcare. In many countries it is provided through single-payer, in some it is through mandatory private insurance, in others it is a mix.

Where the United States stands alone is not the lack of a universal government program, but that we have many millions of people not covered by any health insurance system at all.

Fair enough, I don't necessarily see a problem with a non-single payer universal health insurance system as long as it is affordable for people.