Can you help with the (Brief) aspects of the geographic spaces of United States and Puerto Rico? Please, see instructions below. Notes: Please be brief. Answer in same structure and not wikipedia. Present any references.

1) The characteristics of the geographic space of the United States.

a) Determined location:

b) Particular size:

c) Interaction with other spaces:

d) Similarities and differences as a principle for regionality:

e) Geo factors:

f) Change and transformation: