The Great War - Breakthroughs

Harry Turtledove

When the Great War engulfed Europe in 1914, the United States and the Confederate States of America, bitter enemies for five decades, entered the fray on opposite sides: the United States aligned with the newly strong Germany, while the Confederacy joined forces with their longtime allies, Britain and France. But it soon became clear to both sides that this fight would be different--that war itself would never be the same again. For this was to be a protracted, global conflict waged with new and chillingly efficient innovations--the machine gun, the airplane, poison gas, and trench warfare.

See on goodreads | librarything