Cyclical theory

The cyclical theory refers to a model used by historians Arthur M. Schlesinger Sr. and Arthur M. Schlesinger Jr. to explain the fluctuations in politics throughout American history. In this theory, the United States's national mood alternates between liberalism and conservatism. Each phase has characteristic features, and each phase is self-limiting, generating the other phase. This alternation has repeated itself several times over the history of the United States. The cyclical theory refers to a model used by historians Arthur M. Schlesinger Sr. and Arthur M. Schlesinger Jr. to explain the fluctuations in politics throughout American history. In this theory, the United States's national mood alternates between liberalism and conservatism. Each phase has characteristic features, and each phase is self-limiting, generating the other phase. This alternation has repeated itself several times over the history of the United States. A similar theory for American foreign policy was proposed by historian Frank J. Klingberg. He proposed that the United States has repeatedly alternated between foreign-policy extroversion and introversion, willingness to go on international adventures and unwillingness to do so. The features of each phase in the cycle can be summarized with a table. The Schlesingers proposed that their cycles are 'self-generating', meaning that each kind of phase generates the other kind of phase. This process then repeats, causing cycles. Arthur Schlesinger Jr. speculated on possible reasons for these transitions. He speculated that since liberal phases involve bursts of reform effort, such bursts can be exhausting, and the body politic thus needs the rest of a conservative phase. He also speculates that conservative phases accumulate unsolved social problems, problems that require the efforts of a liberal phase. He also speculated on generational effects, since most of the liberal-conservative phase pairs are roughly 30 years long, roughly the length of a human generation.