Well here we go.
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Prolouge
"A true history of human events would show that a far larger proportion of our acts are the result of sudden impulse and accident than of that reason of which we so much boast."
- Peter Cooper
The relative peace of the United States of America, prior to the Civil War, was not one which was pre-destined. Indeed, war with Britain seemed inevitable during the Napoleonic Wars, drummed up by the more jingoistic members of the American press, in reaction to British measures against American commerce bound for France and the kidnapping of American citizens to serve with the Royal Navy. Thankfully cooler heads prevailed, Federalist candidate Charles Pinckney narrowly won the 1808 Presidential election on the basis of 'No Americans in a European War', pointing out the relative weakness of American ground and naval forces against the most powerful nation on earth.
The diplomacy legacy set by Pinckney's meetings with Lord Liverpool would have a bearing on the threatened engagements with various Native American tribes, after the heated debate over the controversial 'Indian Removal Act' in 1830 threatened a genocidal conflict on the Northern American continent. Osceola's visit to the White House would be historic, and although it would cost President Adams any chance of running again, it would develop a system of Native American Autonomy that would act as a peaceful template for years to come.
The Whigs and Libertarians of the forties would exercise a new diplomatic force in their dealings with the Mexicans. Though there were many calls for war by overconfident Democratic congressmen, the power of finance prevailed with Texas, California, New Mexico and Nevada being sold to America for a relatively small sum by the cash stripped Mexican Empire. Territory quickly paid for itself with the discovery of gold in California, the American economy boomed without a single drop of blood.
It is perhaps ironic that the American diplomatic tradition would fail, not with the Europeans, Native Americans or Mexicans, but when looking inward...