Based on what you already know about the american frontier, what obstacles do you think american settlers had to overcome to conquer it?
check all you think apply.
american indians
foreign nations
harsh weather conditions
rugged landscapes
lack of transportation
disagreements among political leaders
conflicts between settlers

American Indians

Harsh Weather Conditions

Disagreements among political leader

and Conflicts between settlers.

Explanation:

Settlers had to start over and had to deal with a lot of things that they weren't used to. Many had to govern themselves and would not agree on how to do so. The soil was good, but the weather was different. There was the indigenous people also, who weren't really happy with the arrival of the white men.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain