Final answer:
The excerpt could best be used by historians studying the growth of the abolition movement in the United States.
Step-by-step explanation:
The excerpt could best be used by historians studying the growth of the abolition movement in the United States. The excerpt mentions the opposition to slavery and the desire for all men to be free, which are central themes of the abolition movement. Historians could analyze the excerpt to understand the motivations, strategies, and impact of the abolition movement during this time period.
Learn more about abolition movement