"Man, you just can't ever admit that you're wrong, can you?"
I think that your multiple failures to acknowledge that you were wrong on the trade issue and your failure to acknowledge that the data on tariff collection has nothing to do with point of consumption discussed earlier show not only your errors, but this recent post shows that you wish to continue to be argumentative and to find some little blemish to grab onto and point a finger in an effort to regain some credibility.
"Okay, I choose to define it as Steam Boats,"
That you did. And that is an assumption.
"and I've got corroboration from a variety of sources to show that I'm right"
You could claim that Lincoln was gay, do a Google search, and come up with all sorts of "corroboration". But it would not make you "right".
The only corroboration is a footnote on the document stating specifically what you assume.
And it is not there.
So, you are left with an assumption, not fact.
And like Gianni pointed out, you and yours have apparently forgotten the point that started this discussion.
No one except you mentioned steam boats or their relevancy.