Jem<span> is very surprised and shocked when the jury says that Tom Robinson is guilty. He thought Atticus had surely won the trial for Tom and they were going to win.</span>
People tried to abide by them and then realized how imperfect we all are, and they realized that we need salvation.
Because there needed to be legislation to rule the new country with. The Constitution was not yet written, and this was what was there instead. After the Articles of Confederation failed, the Constitution was instituted and enforced.