After his death, Arthur was described thus by his friend and educational collaborator Theodore Dwight Weld, who called him one of humanity's "great benefactors": So simple in all his tastes and habits, so quiet and modest, yet so firm, independent, and conscientious, that nothing could swerve him from the right — so careful and deliberate in forming conclusions, yet instant and indomitable in executing.
[4] Arthur Tappan was one of two signatories who issued a disclaimer on behalf of the American Anti-Slavery Society, of which he was president, in the aftermath of the riots, emphasising its dedication to abolishing slavery within the existing laws of the United States.
"[2]: 405 Their philanthropic efforts crippled and pledges not met, the Tappans were forced to close their silk-importing business, and almost their paper, but the brothers persevered.
In the 1840s, they founded another lucrative business enterprise when they opened the first commercial credit-rating service, the Mercantile Agency, a predecessor of Dun & Bradstreet.
In 1833, while a principal owner of the Journal of Commerce, Arthur Tappan allied with William Lloyd Garrison and co-founded the American Anti-Slavery Society.
In early July 1834, Lewis Tappan's New York home was sacked by a mob, who threw his furniture into the street and burned it.
James Gordon Bennett, Sr.’s rival New York Morning Herald denounced “"the humbug doctrines of the abolitionists and the miserable fanatics who propagate them," particularly Lewis Tappan and the Journal of Commerce.
Both men lived long enough to see the Emancipation Proclamation and the Thirteenth Amendment eliminate slavery in the United States, granting freedom to millions of African Americans.