▁life , ▁which ▁usually ▁sp ans ▁between ▁ 8 0 ▁and ▁ 9 0 ▁years , ▁although ▁some ▁sa ec ula ▁have ▁last ed ▁longer ). ▁The ▁theory ▁states ▁that ▁after ▁every ▁sa ec ul um , ▁a ▁crisis ▁recurs ▁in ▁American ▁history , ▁which ▁is ▁followed ▁by ▁a ▁recovery ▁( high ). ▁During ▁this ▁recovery , ▁institutions ▁and ▁commun itar ian ▁values ▁are ▁strong . ▁Ult imately , ▁succeed ing ▁gener ational ▁arch et ypes ▁attack ▁and ▁weak en ▁institutions ▁in ▁the ▁name ▁of ▁aut onomy ▁and ▁individual ism , ▁which ▁ultimately ▁creates ▁a ▁tum ult uous ▁political ▁environment ▁that ▁rip ens ▁conditions ▁for ▁another ▁crisis . ▁ ▁Schles inger ▁cycles ▁of ▁United ▁States ▁history ▁▁ ▁The ▁Cy clic al ▁theory ▁( Un ited ▁States ▁history ) ▁is ▁a ▁theory ▁of ▁US ▁history ▁developed ▁by ▁Arthur ▁M . ▁Schles inger ▁Sr . ▁and ▁Arthur ▁M . ▁Schles inger ▁Jr .. ▁It ▁states ▁that ▁US ▁history ▁altern ates ▁between ▁two ▁kinds ▁of ▁phases : ▁ ▁Liberal , ▁increasing ▁dem ocracy , ▁public ▁purpose , ▁concern ▁with ▁the ▁wrong s ▁of ▁the ▁many ▁and ▁human ▁rights ▁ ▁Conserv ative , ▁containing ▁dem ocracy , ▁private ▁interest , ▁concern ▁with ▁the ▁rights ▁of ▁the ▁few ▁and ▁property ▁rights ▁Each ▁kind ▁of ▁phase ▁generates ▁the ▁other . ▁Liberal ▁phases ▁generate ▁conserv ative ▁phases ▁from ▁activ ism ▁burn out , ▁and ▁conserv ative ▁phases ▁generate ▁liberal ▁phases ▁from ▁accum ulation ▁of ▁un sol ved ▁problems . ▁ ▁K ling berg ▁cycles ▁of ▁United ▁States ▁foreign ▁policy ▁▁