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.
More trust and empathy since they were willing to give their lives for their country, when all they found when they returned was segregation and bullying from people who stayed at home comfortable when the African Americans that had fought, fought for their life in the battle grounds and the White Americans wouldn’t even thank them for their service.
Stamp act, battle of Lexington and concord and then the Boston tea party
The American Revolution had an important alliance with France in 1778, after having their trust by winning the battle in Saratoga. The French not only recognized the new United States but also trade concessions and privileges. One year later in 1779, Spain joined the war against the UK in the side of France. The French decision to join the infant United States in its fight for independence was by far the most important factor in America’s winning the Revolutionary War.
It was the constitution because they wanted to establish a better government.
