Answer:
American society upholds the love of freedom, equality, and the pursuit of happiness.
Step-by-step explanation:
Only this sentence best describes, what American Identity is. We may include some other points, such as diversity, democracy, pursuit of education, patriotism, faith in government, willingness to experiment etc.
All other points just talk about identity and do not describe what it is.
The concept of American identity has changed very little over time.
People do write about American identity e.g Let America be america again (a poem), in fact there are too many to mention both prose and poetry.
The literature of America has captured the diversity of the country, but generalizing it with "always" will not be a good idea.