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The Battle of Antietam was a triumphant victory of the Confederacy,The Union was in retreat as the Army of Northern Virginia marched to Philadelphia,The War was basically over when Great Britain recognized the Confederacy Two Weeks later,The British sent supplies and invaded the Union from Canada, The United States now had to fight a war on two fronts,Detroit was besieged within a week of Great Britain joining the War,most of Northwestern New York was taken by Britain, as for the Southern Front,the Confederacy captured Philadelphia due to Union Troops being tied up in the Northern front against Great Britain,The Union was forced to negotiate Peace was Confederate and British Troops were marching toward Washington, The Treaty of Richmond stated that:
The US Recognize the CS
The US cede New Mexico,Arizona,Kentucky,Tennessee,Maryland,Delaware,and Washington DC to the CS