Empires last a couple hundred years before they fall horrendously.
USA is no exception. The world is feeling its grip loosening upon the global economy, as greater superpowers like China are vying to take its place. Issues within its own society, massive gun violence, hyperinflation, continuous deterioration of the climate and the environment (granted this one's on a global scale but they are the main offenders) and a lot more that spells doom for the once glorious state nation that is America. So when people say that USA can become the biggest economy in the world, I laugh. There's immutable evidence laid in front of our eye sockets, all we have to do is open our eyes and see America for the sick man it is right now. I sure hope there's a turn around still, but all roads lead towards that dreadful path.
The first opinion, after reading your post - you do not understand at all what an "empire" is ... Well, seriously - if you "pull" this status on the United States, you definitely do not understand the meaning of this word
Question number two - have you ever personally been to the USA?
Question number three: you are sitting in front of a computer (American development and REALIZATION), chatting on the Internet (American development and REALIZATION), and writing that "... the USA can become the largest economy in the world, I laugh"
This is not a question, the question is - what has YOUR country given to the world?