Answer:
Alliance with France
Step-by-step explanation:
America was unfortunate in that for most of the period from 1803 to 1812 political power in England was held by a group that was pledged not only to the defeat of France, but also to a rigid maintenance of Britain's commercial supremacy."[12] That group was weakened by Whigs friendly to the US in mid-1812 and the policies were reversed, but the US had already declared war. By 1815, Britain was no longer controlled by politicians dedicated to commercial supremacy and so that cause had vanished.