The 7-card Nations Expansion for The Manhattan Project allows each player to play the role of a real-world nation (Britain, China, France, Germany, Japan, Soviet Union or USA) in the race to build the bomb!
Each card is essentially a "building" that is immune to Air Strikes and Espionage. This allows each nation to have its own unique ability throughout the game.
Note: This promo is compatible with all versions of The Manhattan Project EXCEPT 2nd Edition, which used a different size of card.
For more information: http://boardgamegeek.com/boardgameexpansion/108421/manhattan-project-nations-expansion