Final answer:
Chapter 23, 'Americans and the Great War, 1914-1919', in Professor Sader's book teaches about the Great War and covers topics such as American isolationism and the European origins of the war.
Step-by-step explanation:
The chapter in Professor Sader's book that taught about the Great War is Chapter 23, titled 'Americans and the Great War, 1914-1919'. This chapter provides an introduction to the Great War, discusses American isolationism and the European origins of the war, explores how the United States prepared for war, and covers the impact of the war on the home front.