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Nerva

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Here's my notes on the ACW -- these are from looking at the POPs of Darkness mod files, but I think they are the same as vanilla for the ACW:

The American Civil War has a MTTH of 12 months once the Upper House is at least 35% Liberal and both the John Brown’s Raid and Dred Scott Decision events have occurred.

The Dred Scott Decision event has a MTTH of 10 months but takes 20X longer pre-1845 and 10X longer pre-1855, and requires one Slave State to have at least 5 Consciousness and the Upper House to be at least 15% Liberal.

The John Brown’s Raid event has a MTTH of 10 months but takes 10X longer pre-1845 and 5X longer pre-1855, and requires one Free State to have at least 5 Consciousness and the Upper House to be at least 20% Liberal.

Consciousness is fairly easy to raise, so the key to triggering the Civil War is to increase Liberalism first to 15%, then to 20%, and finally to 35% prior to the second event firing, so that the ACW will trigger around 12 months after the second event fires.

Liberalism will naturally increase as the country industrializes, but I think there are also some (election?) events that let you advance it vs. other ideologies.