Which early battle proved the Civil War would not be a quick and short war?

The Emancipation Proclamation, was issued by Abraham Lincoln on January 1, 1863. Delivered soon after the union victory at the Battle of Antietam, it freed all slaves in confederate states. The proclamation proved a great motivator for the northern war effort and gave the war a higher purpose.

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well the fact it is basically a peninsula allowed trade to come from many places, thus allowing cultural diffusion to take place. india has seasonal monsoons that merchants travel back and forth from india using the monsoons wind patterns