Which of the following did not contribute to Lincoln's victory in the election of 1860?

the split between northern and southern democrats

the defeat of the Whig party

Lincoln's improved national standing after his senatorial debates with Stephen Douglas

the Constitutional Union party's further splintering the vote

The defeat of the Whig party

Explanation:

The Election of 1860 the following Lincoln victory was marked by slavery and state's rights. During the campaign the Democratic Party divided on the issue of slavery Southern Democrats believed that slavery should expand, Northern Democrats opposed the idea. This division spread around the country.

During the debates, Lincoln showed more political experience and he showed national standing.