The aliens are more clever than kind i think this is the anwser
Rhode Island did not send delegates for Constitutional Convention (May 25th - September 17th, 1787).
Delegates who joined the meeting represented: Connecticut, Delaware, Georgia, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, South Carolina and Virginia.
Jerome did not specifically make an official acknowledgement to any particular person on the three men in a boat. But he did mentioned that he got the inspiration and the materials for this book from his honeymoon trip in 1888. Hope this helps