Final answer:
In his July 4, 1821 speech, John Q. Adams emphasized the United States' success in upholding the Declaration of Independence's principles, particularly securing life, liberty, and pursuit of happiness, and establishing a government based on the consent of the governed.
Step-by-step explanation:
John Q. Adams, in his speech on July 4, 1821, highlighted the accomplishments of the United States in adhering to the principles laid out in the Declaration of Independence. Adams believed that the American government had been successful in securing the right of life, liberty, and the pursuit of happiness for its citizens. He posited that the government's just powers were derived from the consent of the governed, as was the revolutionary idea expressed in the Declaration of Independence. While the ability for every person to vote and the abolition of enslavement were significant issues at the time, Adams's speech was focused more on the philosophical accomplishments of the nation such as ensuring governance based on the people's consent.