http://en.wikipedia.org/wiki/Distribution_of_wealth
http://en.wikipedia.org/wiki/Distribution_of_income
http://en.wikipedia.org/wiki/Income_..._United_States
http://en.wikipedia.org/wiki/Gini_index
"As of 2006, the United States had one of the highest levels of income inequality, as measured through the
Gini index, among
high income countries, comparable to that of some middle income countries such as
Russia or
Turkey,
[15] being one of only few
developed countries where inequality has increased since 1980"
As for the whole "standard of living" thing, there are a variety of indices, the United States isn't first in any of them. In terms of countries who are consistently ahead of us, you're looking at places like Ireland, Norway, Sweden, Iceland, etc.
The best one is probably the Economist Intelligence Unit's Quality of Life index - for 2005 we were 13th.
http://www.shannonireland.com/media/Media,2966,en.pdf
Also, its achieved when a government is of the people, by the people and for the people, acting in the best interest of said people.
Not constantly acting in the best interests of itself as a whole, its members as individuals and the interests of corporations.