After 1918
The end of the First World War should have marked the end of the genocide. The allies occupied Constantinople, and trials began to bring the perpetrators of the genocide to justice. But many of the perpetrators such as Talaat Pasha had escaped to Germany where they went into hiding where they were tried in absentia.
The Ottoman Empire was finally broken up after its partitioning by the allies. Many Armenians who had succeeded in fleeing were brave enough to return and take up their lives again. But they found the new regime was no more sympathetic to them than the last. The Turkish War of Independence between Turkish nationalists and Sultan Mehmet VI who nationalists believed was complicit in the allied subjugation of the region was in full swing.
Nationalist forces continued to expel and eradicate Armenians in Cilicia in southern Turkey and Smyrna the home of the last intact Armenian community. The persecution only ended in 1923 when, after annexing most of Anatolia and ousting the sultan, Turkey was formally declared a republic and recognized as a nation. Then, and only then were they content to leave the Armenians alone.
But by this time, the Turkish Armenians were largely no more, reduced to a few hundred thousand people. Armenia itself did not exist as an independent state until 1991 when Russia Armenia regained independence.
Even today, the Turkish government refuses to acknowledge the genocide ever took place and it is illegal in Turkey to talk about it. But the evidence of this forgotten genocide speaks for itself.