N.D. Const. art. III, § 9

A constitutional amendment may be proposed by initiative petition. The proposed amendment may not embrace or be comprised of more than one subject, as determined by the secretary of state, and the secretary of state may not approve the initiative petition for circulation if the proposed amendment comprises more than one subject. If signed by electors equal in number to four percent of the resident population of the state at the last federal decennial census, the petition may be submitted to the secretary of state. All other provisions relating to initiative measures apply to initiative measures for constitutional amendments.