Final answer:
Democrats in the late 1800s were supported by Southern voters primarily because they did not agree with the Republican's Reconstruction programs.
Step-by-step explanation:
The Southern voters in the late 1800s solidly supported the Democratic Party primarily because Democrats disliked the Reconstruction programs of the Republicans. After the Civil War, Republicans, the party of Lincoln, were viewed as the party that had freed the enslaved. Their efforts to provide Black people with greater legal rights earned them the support of African Americans in both the South, where they were newly enfranchised, and the Northeast.