When clicking your link, for me it opened the following query on Wolfram Alpha: `what%27s the total population of the United States%3F`

Funnily enough, this was the result: `6.1% mod 3 °F (degrees Fahrenheit) (2015-2019 American Community Survey 5-year estimates)`

I wonder how that was calculated...

Wolfram alpha never took input in such a natural language. But something like population(USA) and many variations thereof work.