Section 5. Taxes shall be uniform upon the same class of property including franchises within the territorial limits of the authority levying the tax. The legislative assembly may by law exempt any or all classes of personal property from taxation and within the meaning of this section, fixtures, buildings and improvements of every character, whatsoever, upon land shall be deemed personal property. The property of the United States, to the extent immunity from taxation has not been waived by an act of Congress, property of the state, county, and municipal corporations, to the extent immunity from taxation has not been waived by an act of the legislative assembly, and property used exclusively for schools, religious, cemetery, charitable or other public purposes shall be exempt from taxation. Real property used for conservation or wildlife purposes is not exempt from taxation unless an exemption is provided by the legislative assembly. Except as restricted by this article, the legislative assembly may provide for raising revenue and fixing the situs of all property for the purpose of taxation. Provided that all taxes and exemptions in force when this amendment is adopted shall remain in force until otherwise provided by statute.