What would happen if an amendment to the US constitution was passed repealing the entire constitution? What would the legal status of the states, DC, and the territories be after the dissolution of the federal government?
The United States of America treats each individual state as a sovereign entity, subject to constraints imposed by the Constitution.
If the entire Constitution were repealed without providing for any successor constitution, the 50 states would become individual nations. I'd expect DC to revert to Maryland, which ceded that property to the federal government, and the territories would become independent entities, as well.