[radicalamericannationalist]

BTW, thew phrase is not "to regulate trade" but "To regulate commerce with foreign nations, and among the several states, and with the Indian tribes." The Founders had a phrase for "encouraging manufactures" and it was " encouraging manufactures." The plain meaning of the word "commerce" is not "encouraging manufactures."

[tacticalogic]

Here's a link to the document. I believe it's plain enough he'd talking about the Commerce Clause. The last link I gave you explained it a lot more broadly, and it greater detail.