《独立宣言》中有这样一段话

We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.

我看过很多史书，大多重要的政治宣言中无外乎自由，民主，独立等等。此中最后一条追求幸福的权利，富兰克林他们是怎么想到的？也许这种东西是人生都在追求而难以得到的东西，但是几百年前的他们陷入独立战争别说生活连国家都没有，是怎么知道要赋予后来者这种如此重要的权利的？？