When should government be
changed or altered? (Declaration of Independence)

Answer

When the government is not sustaining the country

Explanation:

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.

the main objectives of the progressive movement were eliminating problems caused by industrialization, urbanization, immigration, and political corruption.