Depending on your definition 26 years
Answer:Cornwallis' surrender at Yorktown effectively ended the Revolutionary War. Lacking the financial resources to raise a new army, the British government appealed to the Americans for peace.
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Innovations of Emperor Shi Huangdi
Qin Shi Huang standardized writing, a crucial factor in the overcoming of cultural barriers between provinces, and unifying the empire. He also standardized systems of currency, weights, and measures, and conducted a census of his people.
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William Penn initially requested his land grant be named “Sylvania,” from the Latin for “woods.” Charles II instead named it “Pennsylvania,” after Penn's father, causing Penn to worry that settlers would believe he named it after himself.