It is the text of the prayer composed by D.R. Joseph Yesurun Pinto (acting) rabbi of Jews Synagogue in New York City on October 23, 1760 on the occasion of the day being "appointed by proclamation for a general thanksgiving to Almighty God, for the reducing of Canada to His Majesty's dominions."
This is only two of seven pages. It's mostly tehillim and some of it is two tefillos he composed himself, one said by shacharit and one by mincha (or maariv?).