I think that the USA is "the land in the middle".

In ancient China, as I have seen in a documentary, they viewed themselves as "the land in the middle" and this is how it is studied in schools.

What does it mean to be the land in the middle? It refers to the center that possibly has all other places at an equal distance. If we were talking about a volume, we would say "center of gravity", which has the different weights distributed evenly in different directions. Weights, not volumes.

The human body also has a center of gravity.

I believe that the USA is "the land in the middle" because it has a coast on the Pacific and another on the Atlantic.

Russia is a singular actor, it has weight, it also has size, although it does not have a large population compared to other actors. The USA does not have a coast on the Pacific; it has the Mediterranean and Russia. I won't elaborate.