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.

levels of production can be increased by technology while holding labor and capital constant, because increased technology makes the production process more efficient. subsequently, the lras curve is almost a vertical line, that can shift to the right, with an increase in technology.

the relationship between the lras curve and the ppc is that both can make the economy could grow. the ppc achieves that when it shifts outward because of more resources or technological advances while the lras curve shifts if more resources are developed or if there are technological advances.

the lras curve is a vertical line at an output level that represents the number of goods and services a nation can produce over a sustained period using all of its productive resources as efficiently as possible with all of the current technology available to it.

the production possibilities frontier (ppf) is a graphical device that is used for economic analysis of production decisions because the ppf measures the maximum possible combinations of two goods that an economy is capable of producing with its currently available resources and technology.