Red Sunday, in which 250 Armenian intellectuals and community leaders in Constantinople, Ottoman Empire (now Istanbul, Turkey) are arrested and deported to detention centres, marks the beginning of the Armenian Genocide.
Between 600,000 to 1,800,000 Armenians died during the Armenian Genocide, which took place within the Ottoman Empire from 1915 to 1923. It is seen as one of the first modern genocides, and is the second most-studied genocide after the Holocaust.
Turkey continues to deny the genocide took place, and Armenian activists within the diaspora have pushed for its recognition in other countries. Twenty countries and 42 different U.S. states have recognized the events as a genocide. However, U.S. president Barack Obama has never referred to it as such since he took office in 2008.