According to the [[University of Cambridge]], historically, the "most notable spread of atheism was achieved through the success of the 1917 [[Russian Revolution]], which brought the [[Marxism-Leninism|Marxist-Leninists]] to power."<ref name="Marxism-Leninism">{{cite web|url=http://web.archive.org/web/20130728215151/http://www.investigatingatheism.info/marxism.html|title=Investigating atheism: Marxism|publisher = [[University of Cambridge]]|quote=The most notable spread of atheism was achieved through the success of the 1917 Russian Revolution, which brought the Marxist-Leninists to power. For the first time in history, atheism thus became the official ideology of a state.|year=2008|accessdate=July 17, 2014}}</ref> The [[collapse of atheism in the former Soviet Union]] led to rapid [[desecularization]] in the region of the former Soviet Union and was a significant blow to the secular left.
== USA and the Britain: Ronald Reagan and Margaret Thatcher ==
=== Ronald Reagan===