Why did the Battle of New Orleans occur after a peace treaty was signed

Both the British and American troops were unaware of the peace treaty that had been signed between the two countries in Ghent, Belgium, a few weeks prior, and so the Battle of New Orleans occurred despite the agreements made across the Atlantic.

Explanation:

answer; slavery should be outlawed in the new country, was part of the initial draft of the declaration of independence, but not part of the final