Because Cato fought on the side of the British in the American Revolutionary War, it makes sense that his resolution entails his moving to Canada to start a new life. While the dissolution of British rule over the American colonies was quite anxious and nasty, England and Canada maintained their ties for much longer, with the two eventually coming to mutual agreement that Canada should become a separate nation.
We never find out what happened to the sailor who was tarred and feathered. The last time we see him, he is lying on the doctor's bed in severe pain while wrapped in bandages and apparently suffering from an infection contracted through his wounds. Although given the primitive state of medical technology in the 18th century, it is unlikely that he survived and probably suffered for quite a long time before dying.
Henri is adopted by Lafayette and goes with him to France after the American Revolution's end. Anyone who knows much about the French Revolution would most likely know that the Lafayette family suffered a great deal under the Jacobins' rule, and that he and his wife and son only narrowly escaped the guillotine. Is Henri absent from France's history books because he didn't escape?
Lafayette adopting Henri also gets pretty depressing when you realize that Henri is the masculine version of the name Henriette, which is the name of Lafayette's daughter who died while he was overseas fighting in the American Revolution.
