Answer :

-America is still a country where a person with great idea or skills can become very successful. It's easier than in any other place to start a new venture and find capital to expand your enterprise. What counts is your idea, not your background. 
-Americans are still proud of their country (in Forbes patriotism ranking USA ranked at the first place).
-American constitution didn't change that much over time and it still held in highest regard by US citizens.
-Civil liberties like freedom of speech and private property are being safeguarded, 
-America is open to immigrants.
-America remains a very religious nation.
-Americans still are very liberal when it comes to market and conservative in beliefs.
-Americans don't count on government to take care of their problems, but instead take initiative, inheritance from the times, when country was still being formed.

It's worth mentioning thatsome of above "feats" are less explicit nowdays, than they were in the past.
Hope it helped :)