The Declaration of Independence

According to the Declaration of Independence, why do people create a government? In other words, what is the purpose of government?  From where does the government get its power to rule? What should happen when a government forgets what its purpose is and acts outside of that purpose?

Thomas Jefferson, the author of the Declaration, provided a long list of abuses committed by King George of England against the American colonists. They are presented like a bullet list. Which three crimes or abuses do you think are the worst? Please list them.