Our capacity for create weapons has grow faster than our wisdom to use them. For fear man kind has used the technology to create weapons that suppose keep the peace.
One day we realised we were wrong. But then...was already too late.
Now the planet is divided, your mission is lead and protect a small group that is trying to save what the last world war left.
Manage the resources you have, evolve what needs to be evolved. But remember, on Terminator World War, you can't show mercy to your enemies.
The same technology that destroyed the civilization is the only chance the humanity have.