The widespread aspiration of Americans to live better than their parents did WordNet 3.0 & Open English WordNet

The American Dream is the national ethos of the United States, a set of ideals including representative democracy, rights, liberty, and equality, in which freedom is interpreted as the opportunity for individual prosperity and success, as well as upward social mobility for oneself and their children, achieved through hard work in a capitalist society with few barriers. Wikipedia

National ethos of the United States in which freedom includes a promise of the possibility of prosperity and success. Wikipedia Disambiguation

Ethos of the United States Wikidata

A philosophy that with perseverance, courage and determination, anyone can prosper and achieve success. Wiktionary

Philosophy. Wiktionary (translation)