In 1837 the US was approached by the Texas Republic requesting annexation, following a vote by Texas in favor of annexation. I believe that GB, wanting to ensure its relationship with Mexico and a place at the table when 'nation building', sent warning signals to the US related to this, and annexation didn't occur for almost a decade.
At the same time we have the issues of the Aroostok Valley in Maine and (eventually) the issues of the Oregon Territory, causing problems in the relationship between these countries. In short, factors favoring war were quite high between 1837 and 1845.
Further, GB at the same time was beginning to have problems related to the Indian Subcontinent, and Europe was increasingly facing republican movements.
Given this, what if the Webster - Ashburton treaty process breaks down after the US accepted an earlier Texas Annexation? Would war be likely then, or as part of war with Mexico later?
At the same time we have the issues of the Aroostok Valley in Maine and (eventually) the issues of the Oregon Territory, causing problems in the relationship between these countries. In short, factors favoring war were quite high between 1837 and 1845.
Further, GB at the same time was beginning to have problems related to the Indian Subcontinent, and Europe was increasingly facing republican movements.
Given this, what if the Webster - Ashburton treaty process breaks down after the US accepted an earlier Texas Annexation? Would war be likely then, or as part of war with Mexico later?