You are betraying your ignorance. The colonies lived under a monarchical form of government where all must swear allegiance to a King. The revolution was not intended to preserve a monarchy, or even about replacing one monarch with another. Its intent was to end monarchy and create a Republic based on the rule of law.
It is an insult to history to equate the cause of the Revolution and the lame excuses (only conjured only after the war) for the secession of the slave states. At the time of secession, they were quite honest that the only difference they had and the only thing they cared to preserve, was their ability to spread slavery where ever they could.
It is you who are betraying you prejudices with you fairy tale narrative. The American colonies had mostly governed themselves under the Whig policy of Benign Neglect for most of the 18th century. When the Tories came into power they set about centralizing authority, raising taxes, and perusing foreign territorial acquisitions. The American colonies would have happily remained within the British Empire had it not been for these changes. The War of independence was a resistance to change and was primarily conservative in nature.
It is an insult to history to simply repeat cartoonish propaganda.