Final answer:
Benjamin Franklin's role as president of the Pennsylvania Society for Promoting the Abolition of Slavery in 1787 confirms the statement is true; he was influential in the early anti-slavery movement in America.
Step-by-step explanation:
The statement that Benjamin Franklin established the first abolitionist society in America is true. Franklin was indeed a pivotal figure in the early movement to abolish slavery in the United States. He became president of the Pennsylvania Society for Promoting the Abolition of Slavery in 1787, which was among the first organizations dedicated to this cause.