French territories on the continent of America; it is agreed, that, for the future, the confines between the dominions of his Britannick Majesty and those of his Most Christian Majesty, in that part of the world, shall be fixed irrevocably by a line drawn along the middle of the River Mississippi, from its source to the river Iberville, and from thence, by a line drawn along the middle of this river, and the lakes Maurepas and Pontchartrain to the sea; and for this purpose, the Most Christian King cedes in full right, and guaranties to his Britannick Majesty the river and port of the Mobile, and everything which he possesses, or ought to possess, on the left side of the river Mississippi, except the town of New Orleans and the island in which it is situated, which shall remain to France, provided that the navigation of the river Mississippi shall be equally free, as well to the subjects of Great Britain as to those of France, in its whole breadth and length, from its source to the sea, and expressly that part which is between the said island of New Orleans and the right bank of that river, as well as the passage both in and out of its mouth: It is farther stipulated, that the vessels belonging to the subjects of either nation shall not be stopped, visited, or subjected to the payment of any duty whatsoever. The stipulations inserted in the IVth article, in favour of the inhabitants of Canada shall also take place with regard to the inhabitants of the countries ceded by this article.

-Article VII. The Treaty of Paris. 1763

Due to The French and Indian War, to where was the western boundary of the British territory in North America extended?

Five of our number in the passage dy'd,
Who were cast into the ocean wide,
And, after sailing seven weeks and more,
We at Virginia all were put on shore. ...

Our faces shav'd, comb'd our wigs and hair,
That we in decent order might appear,
Against the Planters did come us to view,
How well they lik'd this fresh transported crew ...

At length a grim old man unto me came,
He ask'd my trade, likewise my name,
I told him I a tin-man was by trade,
And not eighteen years of age I said ...

At last to my new master's house I came,
To the town of Wicowoco call'd by name,
Here my European cloaths were took from me,
Which never after I could ever see.

Passage adapted from "The Poor Unhappy Transported Felon's Sorrowful Account" by James Revell (1767)

Who is the most likely author of this passage?