They wanted to obtain votes from states that were pro-slavery and by abolishing it they may have ruined the chances of receiving southern states votes for a declaration of independence
Srry i'm soo late but the answer is A. President McKinley's desire for war.
Hope i Helped :)
During the Industrial Revolution, it was common for children to work in factories, mines, and other industrial occupations. Children as young as four commonly worked. ... Working on dangerous machinery had its consequences as many children were injured in accidents.