America is a big deal around the world simply because it represents such a large portion of the world's economy (1/4 by GDP) and military power. Its cultural influence due to Hollywood and the music industry is phenomenally large. Its cultural influence is further bolstered by American fast food and mega brands (Coke, Apple, Michael Jordan) which have penetrated even the farthest reaches of the globe.
As a comparison, take the next two largest countries in the world by population: Indonesia and Brazil. If you go to some random other places... say China, France, South Africa, etc how many American people, places, companies, and movies do you think people will know versus Indonesian and Brazilian?
And Americans, like most rich countries, are relatively well off. When 1/2 the world lives on $2/day or less we're doing pretty well - as is everyone living in a high income country.