I can't believe there is yet another ARW thread.
"I’m guessing Britain would find it difficult to control a population and enforce edicts in say, the Midwest."
Completely right, Britain didn't have much control over the frontiers of the Thirteen colonies. Britain's relationship with the colonies will quickly grow to be one of cooperation, rather than subordination which was how the British dominions functioned.
"It would also be harder to be a representative of the people if you are an ocean away."
Representation for the colonies would have always been difficult and pointless, because Britain will have little power in the colonies, yet the colonies overall will have big power with Britain. However, there will be countless American lobbyists in London.
"This could arguably lead to Britain being more hands off than the Federal government and eventually lead to a more state and local oriented culture, "
This would be an America without a central government, it would be an empire of free nations, and colonies/states would be significantly more culturally distinct.
"especially if Britain leads to a peaceful end to slavery preventing states rights from being associated with slavery."
With the states/colonies being far more distinct, slavery could start dissipating a lot earlier, due to a different dynamic between north and south, and less common identity among southern colonies/state, however the deep south would probably take longer for slavery to go away.
It is a bit of both. The smaller states would likely be consolidated together with stronger state governments.
I agree, so less power for small states, but overall more power for bigger states.
The overall governance for them would probably be Empire-wide. Either Imperial summits like our timelime or some sort of combined EEC/NATO type structure.
The governance is likely to be focused on imperial policy, with almost no control over domestic issues. I'm not sure how much economic control the empire will have, as imperial preference didn't fair well in otl. And the military is likely to just be the British military, as colonies hated having to pay for defence, although there will be some colonial militia.
I think there will be summits and a large colonial office.