Answer:
By stating that the country was founded on the idea of equality
Step-by-step explanation:
The author of the passage is justifying his view that there is something as the American Dream, by making reference to the declaration of independence, which the author quotes.
In the quote, the central idea of the nation is explained: all men are equal, and have basic rights that cannot be violated. To the author, this is the American Dream that is still unfulfilled.