Question

According to the Declaration of Independence when should the people have the right to change their government

Answer 1

To secure the rights . Governments are instituted among the men, deriving their just powers from the consent of the governed. when the government does not protect their natural rights, 

Answer 2

The declaration of independence reads:
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.--That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, --That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government"