The corporation of the City of Mexia, as it shall exist after any extension of its corporate limits, shall be liable for all just and legal indebtedness of said city, without further reference to when same was contracted, and all the property included therein shall be subject to taxation therefor, and the city council shall have full power to enact all rules and regulations by ordinance for the assessment and collection of taxes upon all of said property and property rights in said territory to meet said indebtedness in the same manner and to the same effect as existed previous to such extension.
All ordinances levying or assessing taxes for the fiscal year in which such extension shall be made shall apply equally to all property included within such extended limits, and said taxes shall be collected thereunder upon all the property included in said city limits after such extension.