51st State: Master Set ??Allies

In 51st State: Allies, the second expansion for 51st State Master Set, you discover new ways to ally your factions! Cards now include a new alliance mechanism that grants you new unique bonuses and features. Will you try to unite the factions of the 51st State, or are you going to be a lone wolf? Will you create powerful combos between your allied cards? Finally, do you plan a welcome party for the three new factions that have crossed the wasteland and joined in the fray? Allies introduce Steel Police, Uranopolis, and Sharrash! With them, you will discover new ways to dominate the wasteland!

—description from the publisher