They disliked the adoption of a strict fugitive slave law
bcause everyone farted
There was not a major decision that led to it but there were many that led to it such as the dred Scott decision and the Missouri compromise and the compromise of 1850 and the Lincoln- Douglas debate
The powerful Abolitionist minority were outraged by the Fugitive Slave Act, and 'Uncle Tom's Cabin' was written as a protest against it. This brought many new converts to the cause of Abolitionism.
Railroads
The results of the 1852 US presidential election begins with 1850 and the 1850 Missouri Compromise. It was signed by Whig President Millard Fillmore. It seemed in1850 that both the Whigs and Democrats had accepted the finality of the second Missouri Compromise. With slavery in the territories now off the national scene, there seemed very little to distinguish the parties. In truth, however, the debate over the Compromise had split apart the Whig Party. As 1852 approached, the northern Whigs, who were the base of the antislavery movement nominated the hero of the Mexican War, Winfield Scott for president. Scott was a Virginian and a pro- compromise candidate. Meanwhile the Democrats were never split over the compromise and nominated Franklin Pierce. Many Whigs did not vote and Pierce beat Scott handily, The Democratic Party's platform was the 1850 Compromise.
Sectional compromise did not work in 1860 for many reasons. One of them being that this was the time during the great potato famine in Ireland, so the refugees cascaded into the northern states in the 1850's. Therefore, the north had no room. Once the Europeans were in America, they had no desire for the practice of slavery, and the north states were not convinced to compromise over slavery. The new compromise was put out for grabs, but Lincoln rejected it because he would not allow the extension of slavery. Also, the Crittenden Compromise would allow new slave states, but Lincoln would not accept this, either.
The Fugitive Slave Act was an add-on to the 1850 Missouri Compromise. Many people, not just abolitionists didn't like it at all. Even people not against slavery did not believe it was their responsibility to help enforce it whether they received rewards or not. So basically, the abolitionists found allies among Northern people not wanting to get involved.
a set of rules
Unfortunately it didn't. It was the Missouri Compromise of 1820 that managed to defuse the confrontation for thirty years, but the admission of California as free soil forced Congress to make concessions to the South. With the Fugitive Slave Act, they overdid it. Throughout the USA, members of the public now had to report anyone who looked as though they might be a runaway. This brought many new converts to Abolitionism, and it started the Underground Railroad. It was the first of the many crises of the 1850's that ended in war.
Because they were trying to take away slavery. Southerners needed slaves their plantations.
The Fugitive Slave Act, part of the Compromise of 1850. It backfired badly, attracting many new recruits to the cause of Abolitionism.
The Missouri Compromise of January 29, 1850 helped to avoid a major US crisis. Most national leaders to keep the Union together. In order to do so and admit states to the Union, the question of slavery was the issue. Using the method of extending the southern border of Missouri, it was decided that states above this line were free states and those south of the line could be slave states. Also to be complete, the Congress passed the Fugitive Slave Act. This act was designed to force runaway slaves back to the South. Money and-or penalties were associated with the act. Many Northerners were upset and the South was delighted.