Final answer:
John Fairfield delivered slaves 'on order' by freeing them according to people's requests.
Step-by-step explanation:
John Fairfield's role in the Underground Railroad relates to the subject of Social Studies at the High School level. Fairfield aided the cause by delivering slaves 'on order', which means that people would give him money and a description of the slave they wanted to free, and he would free them accordingly. He did not participate in slave trade markets or prioritize slaves based on their worth.
Learn more about John Fairfield's role in the Underground Railroad