Whenever an existing school district, or a part thereof, is merged into a Class I, II, III, or IV school district under the provisions of section 79-407, 79-408, or 79-473, such merger shall be effective on July 1 immediately following the effective date of the change of city or village boundaries which caused the merger pursuant to section 79-407, 79-408, or 79-473.
Neb. Rev. Stat. §§ 79-475