Sentence:  Weld contributed to the anti-slavery convictions of such men as Joshua R. Giddings and Edwin M. Stanton , enlisted John Quincy Adams , and <WSD>helped</WSD> provide ideas which underlay Harriet Beecher Stowe 's Uncle Tom 's Cabin . 
Meaning of the word marked with <WSD> tags:  give help or assistance; be of service