GMT has made available the final Basic Rulebook, Advanced Naval Rulebook, Player Aid Cards, and Setup Cards for the reprint The US Civil War.
Download them here.
In the most recent GMT Games updated (November 23, 2021) The US Civil War, 2nd Printing Game and Update Kite were marked as “At the Printer”.
The 2nd Printing Game is available here.
The Update Kit is available here.