Republican Party Founded — Precursor to the Civil War
Former Whigs, Free Soilers, and anti-slavery Democrats met in Ripon, Wisconsin to form a new political party dedicated to opposing the spread of slavery. They named themselves Republicans in reference to Thomas Jefferson's Democratic-Republicans.
The Republican Party's formation in opposition to the Kansas-Nebraska Act directly set the political stage for Abraham Lincoln's election in 1860 and the secession crisis that led to the Civil War.
Outcome
Republican Party formed; Lincoln elected 6 years later