Popular Sovereignty was well supported because the southerners argued that it wasn't fair for the south if the North was able to abolish slavery, why couldn't the south do it. It could also have started the Civil War earlier; the North and south were on the brink of war. The compromise of 1850 compromised admitting the state California into the Union, as a free state. What the south got out of that the North had to hunt down and bring back runaway slaves. Because of this decision, Northern Abolitionists were deeply upset from what Congress had done, AKA the House of Representatives and the Senate. This would later start fights in Congress. This also led South Carolina seceding from the Union.(Secession is when a state unlawfully breaks away from a country or province. This also led to the rest of the south except the state of Missouri to secede, and led to Emancipation Proclamation made and announced by the president at the time, President Abraham Lincoln. Also it led to his assassination of him, by John Wilkes Booth, a southerner Confederate. He was later found in a barn, then shot and killed. This led to inauguration of Vice President Andrew Johnson. Which also started Reconstruction; the 10 percent plan by Lincoln, the Wade Davis Bill, and the Radical Republicans. It also led to the black codes and the 13th, 14th, and 15th amendment.
Hope this helped you A LOT :)
