Altering a people’s fundamental governing forms is an act of usurpation.

Evidence

For taking away our charters, abolishing our most valuable laws, and altering fundamentally the forms of our governments; For suspending our own legislatures, and declaring themselves invested with power to legislate for us in all cases He has abdicated government here, by declaring us out of his protection and waging war against us. — Thomas Jefferson, Declaration of Independence, 30