What u. s document states the law for how tyler became president?

John Tyler became president because he was the vice-president when the President died. The legal basis for his becoming president was the Us Constitution.
(The only question was whether he would actually become president or merely act as president amd carry out the necessary duties without actually being a real president. There was objection to his moving into the White House and at first no money was allocated for him to give state dinners or provide other necessary state functions. )

new ideas form the base for the growth of the people.each time they try to develop, they may discover a new form or abilities of themselves this makes the people satisfied in living their life in a happy way.this makes sense that new ideas of people cn change their live.the ideas, if bring their best, they will be changing their present state.