The newest title added to the Xbox One’s backward compatibility list is Activision’s 2010 release Call of Duty: Black Ops.
— Larry Hryb (@majornelson) May 17, 2016
Officially announced on Twitter by Larry “Major Nelson” Hryb, Call of Duty: Black Ops is now accessible to those who have either a physical copy of the game or a digital purchase of the game tied to their Xbox Live account. With the addition of the original Black Ops, the Xbox One’s library of backward compatible games now stands at an impressive 183 titles.
Fans of the game had voted for its availability on Xbox One of the Xbox Feedback page, casting over 112 thousand votes before forum admin Mister Retr0 marked the task as “Completed.” Only four titles have received more votes than Black Ops on the feedback page—Call of Duty: Black Ops II, The Elder Scrolls V: Skyrim, Red Dead Redemption, and Call of Duty: Modern Warfare 2.
Source: Major Nelson on Twitter