It's a lengthy title that didn't fit into the HN title limit. I've edited it to include the word "combined" although the result is still a little unwieldy.

Not really. The original title is a bit misleading in that the 6 countries combined have the same population ad the USA alone.

And the point is that those countries have combined population roughly equal to the US, they’re not, say, the Nordics. A technically correct but almost useless title.