How did physical geography play a role in this country's ability to remain independent

- We have resources to sustain all of our needs

- We have oceans as our natural barriers

Explanation:

In order to be independent, a country need to be able to produce all varieties of goods that are needed for the people to survive. United States possess all of those resources, even the ones to fulfill the tertiary needs. Ranging from Crops, animal products, metals, woods for housing, etc.

On top of that, United States possess rugged mountains and oceans that we can use as a natural barriers to set up a military base that can be utilize to repel invaders.

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well 1 they have there leader that controls them