This 1998 Octavia Butler novel predicted a Christofacist United States with the slogan "Make America Great Again"

Parable of the Talents, a novel by Octavia E. Butler, published in 1998, portrays a dystopian United States under the control of Christian fundamentalists. The group, known as "Christian America," is led by President Andrew Steele Jarret, whose slogan is "Make America Great Again."

From Wikipedia:

The novel is set against the backdrop of a dystopian United States that has come under the grip of a Christian fundamentalist denomination called "Christian America" led by President Andrew Steele Jarret. Seeking to restore American power and prestige, and using the slogan "Make America Great Again." Jarret embarks on a crusade to cleanse America of non-Christian faiths. Slavery has resurfaced with advanced "shock collars" being used to control slaves. Virtual reality headsets known as "Dreamasks" are also popular since they enable wearers to escape their harsh reality.

[Via Kottke]