Well without full context I would assume Trench Warfare because thats what 3 1/2 of the 4 year wars where full of.
You forgot the choices bb
The way that the Constitution was changed by the Reconstruction Amendments was that they expanded what citizenship meant to include nonwhite people.
<h3>How were the Reconstruction Amendments significant?</h3>
The Reconstruction Amendments were such that they gave freed the enslaved people and then gave them citizenship in the United States.
As the enslaved were nonwhites, it meant that citizenship was no longer reserved for only White people. The federal government therefore became a protector of the rights of people.
Find out more on the Reconstruction Amendments at brainly.com/question/24238711.
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