1.) US GDP is 19.73 trillion in 4th quarter 2017, best in the world. https://www.thebalance.com/u-s-gdp-5-latest-statistics-and-h... second best is EU, at 17.1 trillion.
2.) US GDP per capita is $57,000, pretty impressive considering it has a population of 330+ million people and growing. compare that with $8000 for China.
3.) US ranked 3rd in GDP per hours worked, pretty productive for such a big nation https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(PPP)...
4.) Dollar is still the hegemony
5.) US military is the biggest in the world, and has the most combat experiences. It has provoked many wars over the years, some good (toppling dictators, preventing communisms from spreading, advocating democracies), as well as some bad (instilling instabilities in regions)
6.) US innovation is everywhere, in tech (internet, hardware, software), finance, entertainment (games, tv, movies, music), lifestyle, education, services, etc
7.) there's a bigger upper middle class than ever, lower middle class has shrank . http://money.cnn.com/2016/06/21/news/economy/upper-middle-cl...
8.) With tariffs punishing China, Apple/Amazon investments of billions into american cities, and fines levied on China for unfair tech transfers, US will revive manufacturing and economies in middle America