▁successor ▁states : ▁ ▁Czech oslov ak ia ▁ ▁Y ug oslav ia ▁ ▁First ▁Republic ▁of ▁Austria ▁ ▁Hung arian ▁Democratic ▁Republic ▁ ▁Second ▁Polish ▁Republic ▁ ▁C ession ▁by ▁Austria - H ung ary ▁of ▁Trans ylvan ia ▁and ▁B uk ov ina ▁to ▁Roman ia . ▁ ▁C ession ▁by ▁Austria - H ung ary ▁of ▁the ▁southern ▁half ▁of ▁the ▁County ▁of ▁Ty rol ▁and ▁Tri este ▁to ▁Italy ▁ ▁Est ab lish ment ▁of ▁the ▁First ▁Republic ▁of ▁Armen ia ▁ ▁Further ▁B alk an ization ▁ ▁World ▁War ▁II ▁ ▁World ▁War ▁I ▁was ▁one ▁of ▁the ▁main ▁causes ▁of ▁World ▁War ▁II ▁ ▁World ▁War ▁I - related ▁media ▁▁ ▁List ▁of ▁books ▁about ▁World ▁War ▁I ▁ ▁List ▁of ▁World ▁War ▁I ▁films ▁ ▁World ▁War ▁I ▁in ▁literature ▁ ▁World ▁War ▁I ▁in ▁popular ▁culture ▁ ▁Non - f iction ▁▁ ▁Germany ' s ▁A ims ▁in ▁the ▁First ▁World ▁War ▁ ▁F iction ▁▁ ▁F iction ▁based ▁on ▁World ▁War ▁I ▁ ▁World ▁War ▁I ▁remembered ▁▁ ▁World ▁War ▁I ▁re en act ment ▁ ▁W WI ▁mem orial s ▁ ▁World ▁War ▁I ▁Memorial ▁( Ber wick , ▁Pennsylvania ) ▁ ▁World ▁War ▁I ▁Memorial ▁( At l antic ▁City , ▁New ▁Jersey ) ▁ ▁World ▁War ▁I ▁Memorial ▁( E ast ▁Prov idence , ▁Rh ode ▁Island ) ▁ ▁W WI ▁veter ans ▁ ▁See ▁also ▁▁▁ ▁Out line ▁of ▁war ▁ ▁Out line ▁of ▁World ▁War ▁II ▁ ▁References ▁