Which development most directly related to the increased sectional strife immediately prior to the election of 1860?

Southern states were angry because Lincoln didn't get a single vote from them and he still won the election

Explanation:The election of 1860 was one of the most pivotal presidential elections in American history. It pitted Republican nominee Abraham Lincoln against Democratic Party nominee Senator Stephen Douglas, Southern Democratic Party nominee John Breckinridge and Constitutional Union Party nominee John Bell. The main issue of the election was slavery and states' rights. Lincoln emerged victorious and became the 16th President of the United States during a national crisis that would tear states and families apart and test Lincoln's leadership and resolve: The Civil War.

On November 6, 1860, voters went to the ballot box to cast their vote for President of the United States. Lincoln won the election in an electoral college landslide with 180 electoral votes, although he secured less than 40 percent of the popular vote.

The North had many more people than the South and therefore control of the Electoral College. Lincoln dominated the Northern states but didn't carry a single Southern state.

Before Lincoln's inauguration, eleven Southern states had seceded from the Union.