The quote means care for others and not just yourself. Basically, don't be selfish and help other people when you can.
I would probably say remembering or understanding. The best one is probably understanding.
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Without question, you should avoid sentence fragments in formal situations and academic writing. That said, a fragment within a clear context can sometimes serve a valid dramatic purpose. Journalists, bloggers, and fiction writers often use them.
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Explanation:
i feel like proud commited best fits the optimistic tone but when talking about american history it really doesn't ring too well so peace and tempered is the best one