It's going all the way back 1878 Ottoman - Russian war. Ottoman Empire residents Armenians took side of the Russian Empire because of the religious issues, and rebelled against Ottoman Empire. That caused Caucasia to divide, and Armenia was founded. Many migrations took place at that time, many people driven from their homes from Caucasia and come to Anatolia, especially to Black Sea region.
During the first world war, Armenians living in Ottoman soil rebelled again to unite with Armenia and slaughtered many Turkish citizens. Many villages were burned. Even babies were burned alive. Despite of being busy with the war taking place in the west, Ottoman Empire sent a formidable force to East Anatolia to end this slaughter. The army defeated all the Armenian militia, and Ottoman Empire exiled Armenians from their soil to south and grand migration took place.
It's estimated 3 million Turkish people was killed during the Armenian rebellion, and 1,5 million Armenians was dead because of the war, conditions during the migration such as cold, starvation and plague.
To many deaths from both sides, that is the main reason for the hatred. Ottoman Empire never did "genocide", though starvation and plague did.
I wonder what would be the reaction of the USA if 3 million of their own people was slaughtered? Exiling was the most human punishment at the time.
Edit: FYI My Grand grand father's brother was skinned alive at a town near Erzurum.
great introductory post.
in addendum;
Armenians were not exiled per se!
The were not deported either.
They were relocated from their original place, which was then practically a battlefield, to safer places like Syria and Lebanon, which were belonging to Ottoman Empire back then.
It was an intra-Empire move, i.e..
no exile, no deportation took place.
Armenians raised two separate armies of militia; one collaborating with Russians and fighting against the Ottoman Empire within the ranks of Ruskies Empire; tha is from without the Empire!
Second army operated within the Empire and organized raids etc.
EDIT: It is impossible that 1.5 million Armenians were killed, because there were not this high a number of Armenians living in the regions concerned.
again; Turkish official stance is that Armenians as well as moslem locals (Kurds, Turks, Circassians, what not) were killed in inter-ethnicities skirmishes. No denial in there, official position, however, firmly denies that there was a government plan to eradicete Amrnians form the regions, hence you can not see those unfortunate events as a genocide. whynot? to reiterate; there was no plan-conspiracy to kill a certain ethnic-religious-national entity then (which is the mens rea of the alleged culprit in the crime of genocide according to International Criminal Law).
In addition; the crime of genocide was coined after WWII and the convention was adopted in 1948. You cannot enforce law retrospectively.
All in all; people died back then. May they all rest in peace; be they Christian, Moslem and others!