Why do we say "Life, Liberty and The Pursuit of Happiness"?

Meaning:

The three most important rights as defined in the Declaration of Independence.

Background:

"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain inalienable rights, that among these are life, liberty, and the pursuit of happiness" - Thomas Jefferson, The Declaration of Independence, July 4, 1776.

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