House Bill 1431 seeks to amend Chapter 568 of the Private Acts of 1939, which has undergone several amendments since its inception. The bill specifically deletes Article XII from the existing law and replaces it with a new Article IX, which is noted to be repealed by a 2025 Amendment. This change reflects an update to the governance structure or provisions related to the City of Portland.

Additionally, the bill stipulates that it will only take effect if approved by a two-thirds (2/3) vote of the City of Portland's legislative body. The presiding officer of this body is responsible for proclaiming the approval or disapproval of the act and certifying it to the secretary of state. While the act will be effective upon becoming law for the purpose of approval or rejection, it will follow the provisions outlined in Section 2 for all other purposes.