And the British took quite some time to defeat Napolean, I doubt this war would last >3 years *if* it stays contained to US/UK. My division of Oregon follows the Columbia River and stays along 49 degrees for the remainder of the border to the Great Lakes, it very nearly became the border in OTL.
Yes because Britain was negotiating, not dictating the peace.
The delimiter n the area is clearly the Rockies.
I also don't see the UK taking anything south of 46/47N (Duluth MN) unless the UK overruns us entirely, we'd not allow that except in total
defeat.
Why?
Why is the US going to watch it's economy get ruined and it's people reduced to penury in order to hold some land they haven't even settled and is filled with Indians.
The fact of the matter is that a peace will be based upon the parties walking away with what they control, with adjustment made from there.
We also supply our own food, a war causes supply lines and likely higher prices for Britain which is already facing riots over the Corn Laws.
The corn laws actually help in this instance, the British price was already artificially elevated and thus an increase in the cost of imports won't make a difference until it bypasses the domestic level however if it was found the corn laws were having an effect they could simply be suspended for the course of the war.
It should also be pointed out that North America wasn't that important to Britain's imports at the time, by 1850 (when imports had increased due to the Corn laws being removed) Britain got 870,000 bushels from North America compared with 5,106 from Russia and 6,662 from Prussia.
As for the price of bread staying the same in the US, the problem here is transportation.
The Erie canal will be cut preventing the easy flow of materials from the great lake states and New York itself will be blockaded preventing the easy flow of northern grain to the South.
It seems quite likely that the bread cost could increase.
It should be noted that the price of wheat increased considerably during the civil war and it was only the US trade tariff that prevented Britain exporting large amounts to the US (the US did take over Canada's wheat exports almost entirely).