Shriver, Lionel. The Mandibles.

Lionel Shriver, The Mandibles (2016).

To its credit, The Mandibles does actually try to imagine in some detail what it would mean for US sovereign debt to reach a crisis level. The plausibility of the account is, of course, food for debate.

Constance Grady reviews The Mandibles on
In the near future of The Mandibles, Keynesian economics is revealed to be nothing more than “dodgy hocus-pocus” that has massively devalued the dollar. America’s national character has been diluted by the enormous political power of Latino immigrants who have, tellingly, changed the automated phone systems so that you have to dial one for Spanish and two for English.

You can’t trust anyone in power. University economics departments are filled with socialists who will tell you that “morally, your money does belong to everybody.” The president who defaults on the national debt was born in Oaxaca, and he only speaks Spanish at press conferences — so really, you can hardly be surprised when he confiscates the personal property of good, hardworking middle-class (and, it’s implied, white) Americans. The government has become a police state, and you can tell this not through its monopoly on sanctioned violence, but through its monopoly on gold.
Full review here.

See also my review at Goodreads, Ken Kalfus review at The Washington Post, and a blog post by Foz Meadows.