Final answer:
King George III refused to respond to the First Continental Congress's Declaration of Rights and Grievances.
Step-by-step explanation:
King George III responded to the First Continental Congress's Declaration of Rights and Grievances by refusing to respond. The Declaration, adopted by the Congress in 1774, outlined the grievances of the American colonies against British policies. However, King George III and the British government did not give any official response to the document. This lack of response ultimately contributed to the escalating tensions between the colonies and the British Empire, leading to the American Revolution.
Learn more about King George III's response to the Declaration of Rights and Grievances