A '''conspiracy theory''' is a belief, held by a significant segment of society, that is sometimes at odds with accepted wisdom, evidence, and logic. For the bulk of society not to accept such a belief requires that society may be be engaged in some kind of conspiracy to cover up the truth or are victims of [[mass formation psychosis]].
Conspiracy theories often involve a plot by multiple individuals to cause a major event having political consequences, as in the belief conspiracy theory invented by [[Barack Obama]], [[Hillary Clinton]] and other [[liberals]] that [[Russia]] somehow interfered with the presidential election in the [[United States]] in 2016, leading to [[Donald Trump]]'s victory.
It is important to note that conspiracy theories are not always false. Liberals often ridicule conspiracy theories, except when they resort to them to excuse their own failure as when Hillary lost an election that she was heavily favored to win by the [[mainstream media]]. Indeed, many of the most extreme theories are pushed hard by liberals.<ref>https://www.washingtonpost.com/news/monkey-cage/wp/2014/08/21/conspiracy-theories-arent-just-for-conservatives/</ref> In addition to liberals' false conspiracy theory that collusion with Russia enabled [[Donald Trump]] to defeat [[Hillary Clinton]] for president, additional notable conspiracy theories are set forth below.