Okla. Stat. tit. 82, § 1324.24

The creation of all districts and all acts and proceedings taken in the creation thereof and all acts and things done by said districts, pursuant to the provisions of this act are hereby validated; and from and after the effective date of this act all such previously created districts shall be deemed to have been created, and all acts and things done by such previously created districts, henceforth shall be deemed to have been pursuant to and subject to the provisions of this act.