Post-Civil War Reconstruction Big Picture Mark Twain wrote the Adventures of Huckleberry Finn in the 1880s, about twenty years after the end of the Civil War. Why did Twain write a novel about slavery? A bit of background on the post-war Reconstruction period provides insights into the struggles that African Americans continued to face after the abolishment of slavery, which made Twain's story about slavery and Huck and Jim's friendship relevant.