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If there's no ARW and the colonies stay part of the UK, do infrastructure projects like the Erie Canal still get built? There won't be as much America-specific coordination of policy and there won't be any revenues from tariffs, making the America System http://en.wikipedia.org/wiki/American_System_(economic_plan) tough to pull off.
It looks like the other major source of income for the US shortly after the ARW was the sale of public land in Ohio, so at a minimum the Proclamation Line will have to go.