What was the most important reason why abolitionism become more radical after 1850? Because the Fugitive Slave Act angered many Northerners

Because the number of abolitionists in the South increased

Because California became a free state

The correct answer is "Because the Fugitive Slave Act angered many Northerners".

Explanation:

1850 was an important year for Abolitionist Movement, since in that year the Congress approved the controversial Fugitive Slave Act. The Fugitive Slave Act demanded that all escaped slaves must return to their owners and that all American citizens must cooperated with their capture.  Abolitionists known this Act as the "Bloodhound Bill", and it heightened Northern fears of a "slave power conspiracy".

imma say false because i dont know anything about this.

political parties are protected under 6th amendment.