Correct answer choice is :
<h2>D) The closing of the frontier</h2><h2 /><h2>Explanation:</h2><h2 />
A time after the Oklahoma Land Rush, the executive of the U.S. Census Bureau declared that the frontier was closed. The 1890 census had shown that a frontier line, a point behind which the population frequency was less than two persons per square mile, no longer survived. This news had a tremendous emotional influence on many Americans.
The conditions throughout the 18th and 19th century
The u.s constitution, the bill of rights,strong military.
Answer:
Cyrus the Great allowed conquered people to keep their religious beliefs.
Explanation:
I just answered this in my lesson.