What are some ways in which war and freedom have interacted in the American past after the Civil War?

What are some ways in which war and freedom have interacted in the American past after the Civil War?
As always, some do’s and don’t’s:
Do write at least 250 words.
Don’t write more than 500 words.
Do use your own words — I want to know what you have to say!
Don’t look anything up, outside of using your textbook. Your grade for this assignment is based on your ability to answer the question thoughtfully, something I know all of you can do.
Do focus on the past and what you know about it.
Don’t focus on present debates about citizenship.