-Largest Military
-Largest GDP
-Permanent U.N Seat
-NATO leader
-Large Nuclear Stockpile
Undoubted, the USA has by far the biggest military, but in times of nuclear weapons and global alliances, a giant tax money consuming military for conventional warfare is rather outdated.
USA has not the largest GDP, the EU and China excel their GDP. But still without economical allies the US will easily be outnumbered. In terms of PPP; Switzerland, Norway, Singapore, Luxembourg, Ireland, United Arab Emirates and Qatar excel the USA.
Why is a permanent UN seat a criteria for a superpower. however, russia, china, france and great britain have a permanent seat as well ...
NATO leader, which is according to President Trump obsolete.
How many nukes does one country need?