Fourteenth Amendment to the United States Constitution

Section 4. The validity of the public debt of the United States, 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 United States nor any State shall assume or pay any debt or obligation incurred in aid of insurrection or rebellion against the United States, or any claim for the loss or emancipation of any slave; but all such debts, obligations and claims shall be held illegal and void.

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Section 4 confirmed the legitimacy of all United States public debt appropriated by the Congress. It also confirmed that neither the United States nor any state would pay for the loss of slaves or debts that had been incurred by the Confederacy. For example, several English and French banks had lent money to the South during the war.[48] In Perry v. United States (1935), the Supreme Court ruled that under Section 4 voiding a United States government bond "went beyond the congressional power."[49] Legal analyst Jeffrey Rosen has argued that Section 4 gives the president unilateral authority to raise or ignore the national debt ceiling, and that if challenged the Supreme Court would likely rule in favor of expanded executive power or dismiss the case altogether for lack of standing.[50]

[link to en.wikipedia.org]

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Where is the rebellion or civil war necessary to enact this legislation for default of US Debt?