According to Stephens what fundamentally caused the split between North (the nation, i. E. The United States of America) and the South (the Confederacy)?

Defended slavery

Explanation:

Stephens gave an important speech which came to be known as the Cornerstone Speech. In this speech, he reflected on the issue of slavery by defending it that fundamentally caused the split the United States into two - the North and the South. In his speech, he said that the government in the South establish on the idea that slaves were inferior to whites.

answer; i do believe its (wife); good luck