Are Call of Duty Black Ops and Modern Warfare in the same universe?

Everything You Need to Know About Call of Duty: Modern Warfare II Campaign Early Access - Xbox Wire

All Call of Duty games in release order - Dot Esports

Call of Duty games (xbox 360), Modern Warfare, World At War, Black Ops

Call of Duty Modern Warfare 3 To Feature Open-World Zombies

Modern Warfare is a PREQUEL to Infinite Warfare! Same Universe (Modern Warfare Campaign Information)

How Call Of Duty: Black Ops Cold War Connects To Modern Warfare - GameSpot

Call of Duty Black Ops Cold War multiplayer impressions and preview - The Washington Post

In what order should you play the Call of Duty games? - Quora

Intel Gaming Access - It's confirmed: Black Ops and Modern Warfare are in the same, tangled Call of Duty universe

A Popular Perk From Black Ops Universe Has Been Confirmed for Call of Duty: Modern Warfare 3 Zombies! - EssentiallySports

The future world of 'Call of Duty: Black Ops II