when is it acceptable to change your goverment?

Answer 1

Look at the Constitution. It says it here:

We hold these Truths to be self-evident, that all Men are … endowed by their Creator with certain unalienable Rights…. That to secure these Rights, Governments are instituted among Men…. 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, laying its Foundation on such Principles, and organizing its Powers in such Form, as to them shall seem most likely to effect their Safety and Happiness. … Mankind are more disposed to suffer, while Evils are sufferable, than to right themselves by abolishing the Forms to which they are accustomed. But when a long Train of Abuses and Usurpations, pursuing invariably the same Object, evinces a Design to reduce them under absolute Despotism, it is their Right, it is their Duty, to throw off such Government, and to provide new Guards for their future security. Declaration of Independence (1776).

Answer 2

We don’t know