Next, review the definition of the term "frontier." Select the correct definition of frontier."
O the outer limits of what is known, explored, or
settled
an established territory that has been
explored but needs to be settled
an unexplored destination that is rumored to
be available but remains untouched
DONE

Hello there! Its A: the outer limits of what is known, explored, or settled

Explanation:

Correct on edg

(the one before this was a, b, c "Going west... Settlers could... The west's natural..."

The next one is A: has shaped the nation in a basic way.

The one after is B: to make it productive and profitable

Then its B: “To the frontier the American intellect owes its striking characteristics.”

Then for the response Outline I wrote:

"Explain what frontier is. What the people did to do so: Louisiana Purchase example. Why the did so: Manifest Destiny, improve lives, better land, making money, etc"

Then for the actual paragraph I said:

"Frontier means the outer limits of what is known, explored, and settled. Americans during this time were determine to do so and push the limits of exploration. They did so by expanding their territory and and buying lands such as the Louisiana Purchase. Americans did so because they believed in Manifest Destiny. This was pushing them to go tame the country's frontiers and expand their exploration. Manifest Destiny said it was their right and duty to do so. Even though the environment and travel would be dangerous, Americans had to advance and colonize in these new areas. "

(Make sure to change wording :))

i think the answer is the one about environmental and social health.

hope this

i also think it is c