Actually, the US can default on its debt

Source: The Hill
by Desmond Lachman

“As the country heads towards a debt ceiling showdown later this summer, a dangerous idea is gaining currency. It is that the U.S. Constitution makes debt default impossible. … The essence of the idea is that the 14th Amendment to the Constitution unequivocally states that ‘the validity of the public debt of the United States, authorized by law … shall not be questioned.’ If the debt ceiling were breached, so the idea goes, the government would …. have no option but to cut back on its other spending to generate the necessary resources to do so. All is well with this idea except for one thing. Since 1866, when the 14th Amendment was adopted, the U.S. government has defaulted on its debt obligations not once, not twice but at least three times.” 903/08/23)