Why did John Wilkes Booth say you have done it the South is avenged?

John Wilkes Booth expressed "Sic semper tyrannis" ("Thus always to tyrants") and claimed that "the South is avenged" after assassinating President Abraham Lincoln on April 14, 1865. Booth believed that by killing Lincoln, he was avenging the South for what he viewed as tyranny and oppression during the Civil War. He saw Lincoln as responsible for the South's defeat and suffering, and Booth believed that his act would inspire further resistance against Northern dominance. Ultimately, Booth's actions were rooted in his deep-seated Confederate sympathies and desire for Southern redemption.