In which Call of Duty game did the map 'Nuketown' first appear?

In which Call of Duty game did the map “Nuketown” first appear? It first appeared in Call of Duty: Black Ops.

Released in 2010, Nuketown was created by Treyarch for Black Ops’s multiplayer mode. Its setting is a simulated nuclear-test neighborhood in the Nevada desert, built with two houses, a central road, vehicles for cover, and mannequins placed throughout the buildings. The compact, symmetrical layout was designed for rapid close-quarters combat.

The map’s name and setting reflect real American nuclear-test sites, where “doom towns” were constructed to study how explosions affected houses, streets, and household objects. At the end of a match, a nuclear blast destroys the test site, reinforcing the Cold War theme.

A common mix-up is Black Ops II, which introduced the later Nuketown 2025 version. That sequel appearance made the map even more prominent, but it was not the original debut.