Since the Date of the Letter, which the late Congress, by their President, addressed to your Imperial Majesty, the United States of America have thought proper to change their Government, and to institute a new one, agreeable to the Constitution, of which I have the Honor of, herewith, enclosing a Copy. The Time necessarily employed in this arduous Task, and the Derangements occasioned by so great, though peaceable a Revolution, will apologize, and account for your Majesty’s not having received those regular Advices, and Marks of Attention, from the United States, which the Friendship and Magnanimity of your Conduct, towards them, afforded Reason to expect.
https://founders.archives.gov/documents/Washington/05-04-02-0251