User blog comment:Damac1214/Where should Call of Duty go next?/@comment-8197838-20130424234417/@comment-1055346-20130425021026

CoD 1, United Offensive, Finest Hour, Cod2, Big Red One, Cod 3, Roads to Victory, CoD 5, Final Fronts, and WaW DS - 10 WWII Titles

Cod 4, 4 DS, MW2, MW2 DS, MW3, MW3 DS - 6 MW Titles

Black Ops, Black Ops DS, Black Ops Declassified - 3 Cold War titles

Black Ops II - 1 Future title

Conclusion: World War II is the most represented era in the series, it's only matched when all other eras are combined