Question: In what country was the book that Ayn Rand called "a document that could literally save the world" first published?

Context paragraphs:
The God of the Machine: The God of the Machine is a book written by Isabel Paterson and published in 1943 in the United States.  At the time of its release, it was considered a cornerstone to the philosophy of individualism.  Her biographer, Stephen D. Cox, in 2004 described Paterson as the "earliest progenitor of libertarianism as we know it today".

The Ayn Rand Cult: The Ayn Rand Cult is a book by journalist Jeff Walker, published by Open Court Publishing Company in 1999.  Walker discusses the history of the Objectivist movement started by novelist and philosopher Ayn Rand, which he describes as a cult.

The Early Ayn Rand: The Early Ayn Rand: A Selection from Her Unpublished Fiction is an anthology of unpublished early fiction written by Ayn Rand, first published in 1984, two years after her death.  The selections include short stories, plays, and excerpts of material cut from her novels "We the Living" and "The Fountainhead".

Letters of Ayn Rand: Letters of Ayn Rand is a book derived from the letters of novelist and philosopher Ayn Rand, and published in 1995, 13 years after her death.  It was edited by Michael Berliner with the approval of Rand's estate.

The Passion of Ayn Rand: The Passion of Ayn Rand is a biography of Ayn Rand by writer and lecturer Barbara Branden, a former friend and business associate.  Published by Doubleday in 1986, it was the first full-length biography of Rand, and was the basis for the 1999 film of the same name with Helen Mirren playing the part of Rand.

Journals of Ayn Rand: Journals of Ayn Rand is a book derived from the private journals of novelist and philosopher Ayn Rand.  Edited by David Harriman with the approval of Rand's estate, it was published in 1997, 15 years after her death.  Some reviewers considered it an interesting source of information for readers with an interest in Rand, but several scholars criticized Harriman's editing as being too heavy-handed and insufficiently acknowledged in the published text.

Objectivism: The Philosophy of Ayn Rand: Objectivism: The Philosophy of Ayn Rand is a 1991 book by philosopher Leonard Peikoff, in which the author discusses the ideas of his mentor, Ayn Rand.  Peikoff describes it as "the first comprehensive statement" of Rand's philosophy, Objectivism.  The book is based on a series of lecture courses that Peikoff first gave in 1976 and that Rand publicly endorsed.  Peikoff states that only Rand was qualified to write the definitive statement of her philosophic system, and that the book should be seen as an interpretation "by her best student and chosen heir."  The book is volume six of the "Ayn Rand Library" series edited by Peikoff.

It Usually Begins With Ayn Rand: It Usually Begins With Ayn Rand is a satirical memoir by libertarian political activist Jerome Tuccille.  It was first published by Stein and Day in 1971.  The title refers to novelist and philosopher Ayn Rand, whose work Tuccille describes as many activists' introduction to libertarian ideas.

For the New Intellectual: For the New Intellectual: The Philosophy of Ayn Rand is a 1961 work by Ayn Rand, her first long non-fiction book.  Much of the material consists of excerpts from Rand's novels, supplemented by a long title essay that focuses on the history of philosophy.

Isabel Paterson: Isabel Paterson (January 22, 1886 – January 10, 1961) was a Canadian-American journalist, novelist, political philosopher, and a leading literary and cultural critic of her day.  Along with Rose Wilder Lane and Ayn Rand, who both acknowledged an intellectual debt to Paterson, she is one of the three founding mothers of American libertarianism.  Paterson's best-known work, her 1943 book "The God of the Machine", a treatise on political philosophy, economics, and history, reached conclusions and espoused beliefs that many libertarians credit as a foundation of their philosophy.  Her biographer Stephen D. Cox (2004) believes Paterson was the "earliest progenitor of libertarianism as we know it today."  In a letter of 1943, Ayn Rand wrote that ""The God of the Machine" is a document that could literally save the world ... "The God of the Machine" does for capitalism what "Das Kapital" does for the Reds and what the Bible did for Christianity."

Supporting paragraphs: Isabel Paterson The God of the Machine
Answer: the United States