Why must a majority of presbyteries approve amendments to the Presbyterian Church (U.S.A.) constitution?

In the Presbyterian Church (U.S.A.), the requirement that a majority of presbyteries approve amendments to the constitution is a fundamental aspect of the denomination's representative system of church government.

While the General Assembly serves as the church’s highest governing body and is responsible for proposing such changes, the constitution—which includes the Book of Confessions and the Book of Order—is not subject to unilateral alteration by the assembly. By requiring a majority vote from the presbyteries, the church ensures that constitutional changes reflect the collective will of the regional governing bodies rather than just the decision of the national assembly. This process serves as a check on centralized power, maintaining the denomination's commitment to a shared, representative governance structure.1