North Dakota Constitution Art. VIII, § 1

A high degree of intelligence, patriotism, integrity and morality on the part of every voter in a government by the people being necessary in order to insure the continuance of that government and the prosperity and happiness of the people, the legislative assembly shall make provision for the establishment and maintenance of a system of public schools which shall be open to all children of the state of North Dakota and free from sectarian control. This legislative requirement shall be irrevocable without the consent of the United States and the people of North Dakota.