Sentence:  Independence Day is the appropriate date as a symbolical reminder of the American article of faith that governments are instituted among men to secure to them certain inalienable rights , the first of which <WSD>is</WSD> life , and when any government becomes subversive of that end , it is the right of the people to alter or abolish it . 
Meaning of the word marked with <WSD> tags:  be identical to; be someone or something