Lord North was the British prime minister during most of the American Revolutionary War. Frederick North, later the 2nd Earl of Guilford, led the British government from January 1770 until March 1782.
North’s ministry oversaw the growing crisis with the American colonies. After the Boston Tea Party, his government supported the Coercive Acts, called the Intolerable Acts by many colonists. Rather than restoring obedience, those measures intensified resistance and helped push the colonies toward open war in 1775.
North remained prime minister through major events including the British capture of New York and Philadelphia, France’s entry into the war on the American side in 1778, and the British surrender at Yorktown in October 1781. He resigned in March 1782 after news of the Yorktown defeat destroyed political support for his ministry.
George III is a frequent wrong answer because he was the reigning monarch and strongly involved in policy, but he was not prime minister. William Pitt the Elder had served earlier, while Charles James Fox was a prominent opposition politician during much of the conflict.