Literary+Period+and+Country

"Atlas Shrugged" is from the Modernism Literary Period, and it was written in the United States of America. This is a technicality that is only true due to time however. Atlas Shrugged is part of a movement created by Any Rand herself: Objectivism.

The following information has been taken entirely from wikipedia:

Objectivism is a philosophy defined by the Russian-American philosopher and novelist Ayn Rand (1905–1982). Objectivism holds that reality exists independent of consciousness, that human beings have direct contact with reality through sense perception, that one can attain objective knowledge from perception through the process of concept formation and inductive and deductive logic, that the proper moral purpose of one's life is the pursuit of one's own happiness or rational self-interest, that the only social system consistent with this morality is full respect for individual rights, embodied in laissez faire capitalism, and that the role of art in human life is to transform man's widest metaphysical ideas, by selective reproduction of reality, into a physical form—a work of art—that he can comprehend and to which he can respond emotionally.