Poyer, David C. The Shiloh Project
Divergence: 1863 CE
What if: Pickett's Charge succeeded and the Confederacy won at Gettysburg, leading to British recognition of the CSA and Confederate independence.
Summary: 120 years later, both Confederacy and Underground Railroad plan to hijack a Union nuclear artillery shell being shipped past Hampton Roads.
Published: Avon 1981 (0380787334BUY).