What are three rights established by the declaration of independence

The three rights established by the declaration of independence is: Life, Liberty, and the Pursuit of Happiness.

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~A.W ~ZoomZoom44

The correct answer here is D

D.Returning soldiers spread Spanish flu, killing millions, and leaving others unable to work.

It has been cited as the most devastating epidemic in recorded world history. More people died of influenza in a single year than in four-years of the Black Death.Dealing with this flu added problems to already strained economies.