Sure, America is a superpower. However, that does not mean that is it perfect. On the outside, to the rest of the world, America is heaven. Perfect everywhere. However, on the inside, it is not perfect. In fact, it is far from perfect.
Each country has its own problems. Sure, some of them can't be solved, like a geographical issue, or a monetary issue, but not this one. Sure, other countries have issues, but not as severe as this one. The impact is greater than most people will ever experience during their life times, even after dying. But this is worse than ever before.
As a country, we can't fix this. As a group of people, we still can't. We must not separate, or discriminate, but rather unite, collaborate, and become one. Bridges are not built on one big piece, but rather multiple that come together to hold the bridge. Like a bridge's support, you can help fix this issue. It's just a matter of whether not you are able to.
Answer:
Human Community behaves as its tradition, beliefs, modern technology, superstitions, etc. The social problems are these types of problems that are happen in the society. This hampers the society by putting a negative impact in the development process.
The gravitational force is jointly proportional to the masses of the objects involved and inversely proportional to the square of the distance between them. You've mentioned distance, so the other contributor is
1. Mass
The second one, Keen eyesight, so they can stalk prey from a far.