▁Frank ▁K ling berg ▁has ▁proposed ▁a ▁cy clic ▁theory ▁of ▁US ▁foreign ▁policy . ▁It ▁states ▁that ▁the ▁US ▁altern ates ▁between ▁ext ro vert ed ▁phases , ▁phases ▁involving ▁military ▁advent ures , ▁challeng ing ▁other ▁nations , ▁and ▁an nex ing ▁territory , ▁and ▁intro vert ed ▁phases , ▁phases ▁with ▁the ▁absence ▁of ▁these ▁activities . ▁ ▁See ▁also ▁▁ ▁Cy clic ▁model ▁( cos m ology ) ▁ ▁Cy clic al ▁theory ▁( Un ited ▁States ▁history ) ▁ ▁K ond rat iev ▁wave ▁( Long ▁economic ▁cycles ) ▁ ▁List ▁of ▁cycles ▁ ▁Revolution ary ▁wave ▁ ▁Soci etal ▁collapse ▁ ▁State ▁collapse ▁ ▁Stra uss – H owe ▁gener ational ▁theory ▁ ▁References ▁ ▁Further ▁reading ▁ ▁Che ung , ▁Edward , ▁" B aby ▁Bo om ers , ▁Generation ▁X ▁and ▁Social ▁Cy cles ", ▁Long wave ▁Press , ▁ 2 0 0 7 . ▁ ▁Ch u , ▁C . ▁Y . ▁C ., ▁and ▁R . ▁D . ▁Lee . ▁( 1 9 9 4 ) ▁Fam ine , ▁Revol t , ▁and ▁the ▁D yn astic ▁Cy cle : ▁Population ▁Dynam ics ▁in ▁Historic ▁China . ▁Journal ▁of ▁Population ▁Econom ics ▁ 7 : ▁ 3 5 1 – 7 8 . ▁ ▁Fischer , ▁David ▁H ack ett ▁( 1 9 9 6 ). ▁The ▁Great ▁W ave : ▁Price ▁Revolution s ▁and ▁the ▁Rh ythm ▁of ▁History . ▁Oxford ▁and ▁New ▁York : ▁Oxford ▁University ▁Press . ▁ ▁for ▁