Final answer:
The quotation from the Declaration of Independence advances the author's purpose by reminding the reader of the values and principles that all Americans should uphold.
Step-by-step explanation:
The quotation from the Declaration of Independence, "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness," advances the author's purpose by reminding the reader of the values and principles that all Americans should uphold. It serves as an inspiration for the reader to remember that these values of equality and unalienable rights apply to all individuals, regardless of race or ethnicity.