It is clear that the withdrawl of allied support and war weariness in their camps made them less active in support, but how could the Greek presence in Thrace/Western Anatolia be so quickly removed? Not only did they lose the war, but their claims were not even able to be returned being Greek majority. Why did they not meet these goals that were outlined under Sevres? Obviously Greece had a powerful ally on the part of Bulgarians in the first Balkan war, but for the majority of the time the Greeks had tacit French and Italian support. Why did this not seal victory?
Edit: obviously the balkan coalition included more than bulgaria but you know what I mean.
General thoughts/opinions to how this came about are welcome.
The biggest reason Turkey was able to push out the Greeks and their allies had to be the leadership of Mustafa Kemal. By basically taking over and remaking the Turkish army and removing whatever authority the Ottoman Empire had, he was able to give the Turks the fighting power and nationalist vigour that had been so lacking in the fading years of the Empire. (i.e. The Balkan Wars) As for the Greeks, they had taken Smyrna on the western Anatolian coast with relative ease (1920), but had overextended themselves when they marched into the interior. When they met Kemal's army they were defeated and pushed back to the Aegean. (1922-23) The allies had supported Greece initially, but lacked any real enthusiasm to lend major military aid. When things started going badly for the Greeks, the allies simply re-opened negotiations with the Turks and settled on pretty much the borders of Turkey today. (1923)
Source: Paris 1919, by Margaret Macmillan