No state debt shall be contracted unless authorized by law for capital improvements or unless authorized by law for housing loans for veterans, and ratified by a majority of the qualified voters of the State who vote on the question. The State may, as provided by law and without ratification, contract debt for the purpose of repelling invasion, suppressing insurrection, defending the State in war, meeting natural disasters, or redeeming indebtedness outstanding at the time this constitution becomes effective.