Shattered Union is a turn-based strategy game, set in 2014 in the United States against a background story of a second American civil war. The player can control any of seven different factions, each of which has at least one unique unit and its own set of sidebar powers:
The Republic of Texas
Great Plains Federation
New England Alliance
The European Union Occupation
These factions wage warfare in different territories; the more territories are controlled, the more income a faction receives. When attacking such a territory, the player selects which of his units should be deployed. The battlefield is represented as a hex grid, though the graphics are full 3D. The objective of the battle is either to destroy all the enemy's units or capture enough objective towns to control the battlefield.
Apart from the campaign, the game provides both a single- and a multiplayer skirmish mode, allowing one-on-one battles.