The general assembly shall have no powers, without the express consent of the people, to incur state debts to an amount exceeding fifty thousand dollars, except in time of war, or in case of insurrection or invasion; nor shall it in any case, without such consent, pledge the faith of the state for the payment of the obligations of others. This section shall not be construed to refer to any money that may be deposited with the state by the government of the United States.