Simplify the following text for a Grade 10 native English-speaking person.
Original: Following the American Revolution , Evacuation Day on November 25 marks the day in 1783 when the last vestige of British authority in the United States -- its troops in New York -- departed from Manhattan .
Simplified: Evacuation Day for New York was the day that the last of the British authorities in the United States ( its troops in New York City ) left Manhattan on 25 November 1783 .