Final answer:
Key 'stationmasters' in the abolitionist movement included Harriet Tubman and Thomas Garrett who aided in the Underground Railroad, leading to the emancipation of slaves by 1865 after the Civil War.
Step-by-step explanation:
The student's question refers to the significant figures in the abolitionist movement and the emancipation of slaves. Two prominent "stationmasters" who contributed vastly to this cause were figures like Harriet Tubman and Thomas Garrett. These individuals were integral to the operation of the Underground Railroad, which helped thousands of slaves escape to freedom. The culmination of these efforts and the abolitionist movement, in general, led to the emancipation of all slaves with the end of the Civil War and the passage of the Thirteenth Amendment in 1865.
Abolitionists employed various tactics to promote their cause, from publishing pamphlets and newspapers to speaking out against slavery and petitioning Congress. Increased awareness and sentiment against slavery led several states to pass laws for gradual emancipation starting as early as the 1780s. Despite the resistance in the South and the deep entrenchment of slavery as a "peculiar institution," the abolitionist movement persisted, resulting in the eventual end of slavery in the United States.