In the Articles of Confederation, the United States' founding fathers provided for Canada (in the form of the Province of Quebec) to join as a 14th state. However, Canada didn't take advantage of it and that option was removed when the Constitution was drafted in 1788. Quebec was later sub-divided into Upper and Lower Canada in 1791, rendering it moot anyway.
Presuming that the Constitution had kept the Articles' clause, which part of Canada would Washington, Adams, and the rest of the leaders of the US have been willing to admit to the USA under that clause? Was either part considered a "more legitimate" successor to the previous province? Would both have been acceptable as states (presuming they were willing)?