Ms. Quain, who is in her 40s, owned a children’s play cafe and preschool near Seattle before she renounced her American middle-class existence in August 2016, fed up with what she described as a stifling, consumerist culture.

Once Donald J. Trump was elected president, she made a common liberal refrain — “If Trump wins, I’m leaving the country” — reality, deciding not to return home with her daughters, Aubrey and Gabriella. After traveling through Asia and Europe, she is now figuring out how to start a business selling products through Amazon to finance the life of an itinerant-by-choice single mother.

“If the G.O.P. gets out of office, if our education system improves, if we get universal health care, I’ll move back to the States because we’ll get tired of traveling,” Ms. Quain said. But until that utopian day arrives, “We’re unplugging from the Matrix.”