Exactly one hundred years ago, Turkey began the systematic mass extermination of 1.5 million Armenians. Turkey today does not deny that the killings occurred so much as they argue that the size of the group slaughtered does not merit the use of the term "genocide". Also, because the despised Armenians were infidels whose holdings the Islamists desired.
It should be noted that the second class citizenship and general abuse prior to the "mass killings" were strikingly similar to what the Jews experienced in Germany just a little later. Interestingly and appropriately, Germany and Turkey were WWI allies.