Arepublic is a form of government where

all citizens take an active role in decision making.
military leaders represent the people.
a chief executive makes all the decisions.
elected officials represent the people.

elected officials represent the people.

Explanation:

A republic is a form of government that states that government is a public matter, and therefore, belongs to the people. In a republic, elected officials represent the people, and these elections are usually carried out in a democratic way. Moreover, most modern nations support the idea of universal suffrage, allowing all their citizens to vote.

answer; i believe the correct answer is (the willamete valley);

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