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Skillfully diplomatic? He's overtly mocking the behaviors of the British Empire. You're also off on your timeline. The 'shot heard round the world' would happen in 1775, not 1773, years after this letter was written. Even the Boston Tea Party hadn't yet happened. His overall complaint, and its solution are also rather plain. Britain was trying to impose their authority like a foreign occupation, rather than treating the colonies as an equal and integrated part of the Empire.

There's probably no timeline where Britain holds onto the colonies simply because of the distance involved - people don't like being ruled by those who don't represent themselves in any meaningful way. But they almost certainly accelerated the end through hubris. They were the Mighty and Civilized British Empire, and the colonies were just uncultured backwoods vagrants who's existence was only at the leisure of the Crown.

There were a bunch of MPs at the time who knew that trying to use force against the Colonies was going to be hell. The British Empire wasn't nearly as strong as it was before, and America was huge. Lord North was way too aggressive in trying to reign in the Colonies, and it was this constant blundering that eventually led the colonies to split. So Franklin wasn't alone in warning the Empire of the dangers of entangling themselves in a fight they might lose.

Indeed. As an American, I found The Rest Is History’s four part series on the American war for independence particularly enlightening.

What you have written (copied from an llm?) is utter nonsense. The publication date for this is 1773, nearly two years before battles in Lexington and Concord start in 1775.