Question

What is a sphere of influence?

Answer 1

http://en.wikipedia.org/wiki/Sphere_of_influence
hope this helps

Answer 2

sphere of influence (or interest)
phrase of sphere
1.
a country or area in which another country has power to affect developments although it has no formal authority.

Answer 3

Sphere of influence is a country or area in which another country's power impacts development without the formal authority. An example of this is during the Cold war there was a capitalist sphere of influence (stretching from USA to West Germany) and a communist sphere of influence (from Russia to East Germany.)