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. )
It means, it can't exist in the US.
<span>Mainly because the Constitution is the supreme law the US and anything that goes against any amendment in the Constitution is unconstitutional and therefore cannot exist as proposed.
From Dementiax on Yahoo Answers</span>
Learned Helplessness - a condition in which a person
suffers from a sense of powerlessness, arising from a traumatic event or
persistent failure to succeed. It is thought to be one of the
underlying causes of depression.
Hope it helped