Personally I don't know if any country can lay claim to "greatest".
There's alot of things I dislike about the USA atm, but most of them are due to how crappy our political bodies are atm, IMO.
Sometimes I think we're alone. Sometimes I think we're not. In either case, the thought is staggering. ~ R. Buckminster Fuller
Perhaps a good question would be: Greatest about what and compared to which other country?
World’s Most Evil and Lawless Institution | Dissident Voice
It gives some detail on the estimated 20 million people - mostly civilians - who have been killed by US forces in the last 50 years. It also gives some analysis of how these killings can be considered "war crimes". Let us know what you make of it.
Yes we are, and Will can STFU.
"He who does not think himself worth saving from poverty and ignorance by his own efforts, will hardly be thought worth the efforts of anybody else." -- Frederick Douglass, Self-Made Men (1872)