solution
There is no objective definition for the greatest nation
but here some things that make America great or make the claim
questionable
- US remains the biggest economy in the world (although
China has overtaken us if counting by PPP)
 
- US has the most powerful army and navy
 
- US is the home of the best universities in the world
especially if we talk about graduate programs
 
- The most educated and entrepreneurial people come here
more than to any other country
 
- If you think about the companies that have changed your
life in the last 30 years: Apple, Google, Amazon, Windows - most of
them are based in the USA
 
- US remains one of the best places to start your own
business
 
- By number of inventions and patents US leads the
world.
 
On the other
hand: it will take next position russia / china may
be
- The political system is becoming more polarized and
unstable
 
- The gap between rich and poor is
increasing
 
- Public schools are often terrible
 
- Even after Obamacare millions of people don't have
medical insurance
 
- The prison population is the highest in the
world
 
- There is no guaranteed vacation/maternity leave/etc-
things that always exist in all developed countries