Worcester, Mass.

A NEW political order is emerging in the Middle East, and Turkey aspires to be its leader by taking a stand against authoritarian regimes. Earlier this week, Turkey’s prime minister, Recep Tayyip Erdogan, went so far as to denounce the Syrian government’s continuing massacres of civilians as “attempted genocide.”

Turkey’s desire to champion human rights in the region is a welcome development, but Mr. Erdogan’s condemnation of Syria is remarkably hypocritical. As long as Turkey continues to deny crimes committed against non-Turks in the early 1900s, during the final years of the Ottoman Empire, its calls for freedom, justice and humanitarian values will ring false.

Turkey’s attempt to cultivate an image as the global protector of Muslim rights is compromised by a legacy of ethnic cleansing and genocide against Christians and terror against Arabs and Kurds. Memories of these crimes are very much alive throughout former Ottoman territories. And Turkey cannot serve as a democratic model until it acknowledges that brutal violence, population transfers and genocide underlie the modern Turkish state.

Using documents from the Ottoman government archives in Istanbul, which were once classified as top secret, I have sought to pull back the veil on Turkey’s century of denial. These documents clearly demonstrate that Ottoman demographic policy from 1913 to 1918 was genocidal. Indeed, the phrase “crimes against humanity” was coined as a legal term and first used on May 24, 1915, in response to the genocide against Armenians and other Christian civilians.