SECTION 3 NEW COUNTIES. No new counties shall be established which shall reduce any county to a population less than four thousand (4,000), nor shall a new county be formed containing a less population than two thousand (2,000). There shall be no territory stricken from any county unless a majority of the voters living in such territory shall petition therefor and then only under such other conditions as may be prescribed by a general law applicable to the whole state. Every county which shall be enlarged or created from territory taken from any other county or counties shall be liable for a just proportion of the existing debts and liabilities of the county or counties from which such territory shall be taken: Provided, That in such accounting neither county shall be charged with any debt or liability then existing incurred in the purchase of any county property, or in the purchase or construction of any county buildings then in use, or under construction, which shall fall within and be retained by the county: Provided further, That this shall not be construed to affect the rights of creditors.