Re: What measure of 'drink' did these Americans use?
"There is no standard so 1 drink is still vague."
To say nothing of the fact that alcohol, the substance that the teetotalers are concerned[0] about, varies from around 2% up to over 50% in drinks that are still called "beer" or "wine".
[0] For values of "concern" that equal "somebody, somewhere, is enjoying themselves and we can't have that!".