How do you measure a countries "usefullness"
Interestingly its thanks to many of those 3rd world countries that are supposedly "useless" that those "useful" countries have their ecomonies. Seeing as most if not all of those "useful" countires depend greatly on the resources they extract from the "useless" countries.
If anything the US should be #1, no matter where you go in the world the US has by far the biggest presence.
Bye