Section 4.
The validity of the public debt of the USA, authorized by law, including debts incurred for payment of pensions and bounties for services in suppressing insurrection or rebellion, shall not be questioned. But neither the USA nor any state shall assume or pay any debt or obligation incurred in aid of insurrection or rebellion against the USA, or any claim for the loss or emancipation of any slave; but all such debts, obligations and claims shall be held illegal and void.