what lead to the fall of the ottoman empire?
World War I
entailment
 The siege 's failure had wide @-@ ranging repercussions . The rescue of Constantinople ensured the continued survival of Byzantium , while the Caliphate 's strategic outlook was altered : although regular attacks on Byzantine territories continued , the goal of outright conquest was abandoned . Historians consider the siege to be one of history 's most important battles , as its failure postponed the Muslim advance into Southeastern Europe for centuries . 

contradiction
 In the aftermath , historians would measure its significance in terms of the delay Marita had or had not imposed on the unleashing of Barbarossa , an exercise ultimately to be judged profitless , since it was the Russian weather , not the contingencies of subsidiary campaigns , which determined Barbarossa 's launch date . 

contradiction
 Eventually , following their repeated failures before Constantinople , and the continued resilience of the Byzantine state , the Muslims began to project the fall of Constantinople to the distant future . Thus the city 's fall came to be regarded as one of the signs of the arrival of the end times in Islamic eschatology . The siege became a motif in Byzantine apocalyptic literature as well , with decisive final battles against the Arabs before the walls of Constantinople being featured in the early 8th @-@ century Greek translation of the Syriac Apocalypse of Pseudo @-@ Methodius and the Apocalypse of Daniel , written either at about the time of the siege or a century later . 

entailment
 Effectively controlled by the Three Pashas after the 1913 coup d 'état , the Ottoman Empire entered World War I ( 1914 – 1918 ) on the side of the Central Powers and was ultimately defeated . During the war , the Ottoman government committed ethnic cleansing or genocide against its Armenian , Assyrian and Pontic Greek citizens . Following the war , the conglomeration of territories and peoples that formerly comprised the Ottoman Empire was divided into several new states . 

contradiction
 Many theories have been advanced in way of explanation for decline of the Roman Empire , and many dates given for its fall , from the onset of its decline in the 3rd century to the fall of Constantinople in 1453 . Militarily , however , the Empire finally fell after first being overrun by various non @-@ Roman peoples and then having its heart in Italy seized by Germanic troops in a revolt . The historicity and exact dates are uncertain , and some historians do not consider that the Empire fell at this point . 
