Article VI, Clause 1 of the Constitution of the United States, known as the Engagements Clause, says:
All Debts contracted and Engagements entered into, before the Adoption of this Constitution, shall be as valid against the United States under this Constitution, as under the Confederation.
The eleventh Article of Confederation says Canada will be admitted into the United States as a new state whenever it so chooses, without any need for an act of Congress to admit them.
Would this mean that if Canada were to decide tomorrow to become a new state in the U.S., it would be immediately admitted without an act of Congress?