Octavian , now Augustus , would be the first Roman Emperor and would transform Change the oligarchic Republic into the autocratic Roman Empire .

In 1820 when Spanish liberals overthrew Change_of_leadership the autocratic rule of Ferdinand VII and arch-conservatives in New Spain saw independence as a way to maintain Preserving their position , former royalists and old insurgents formed Coming_to_be an alliance under the Plan of Iguala and forged Cause_to_amalgamate the Army of the Three Guarantees .