It is true that as a result of the siege of Boston, the British abandoned the city. After eleven months of the siege, the British abandoned Boston and sailed to Nova Scotia.
Serfs/Peasants would live on the protected land of the lord's manor in exchange for food and goods. The serfs/peasants basically fueled the manor and created self sufficiency, to the point where some lords even forbade Serfs/Peasants to leave their estate.
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Martin Van Buren was the eighth President of the United States (1837-1841), after serving as the eighth Vice President and the tenth Secretary of State, both under President Andrew Jackson.