Final answer:
Lincoln's plan to prohibit slavery led to the Emancipation Proclamation, which declared the freedom of slaves in Confederate territories but did not free all slaves immediately.
Step-by-step explanation:
Abraham Lincoln's plan to prohibit slavery primarily led to the issuance of the Emancipation Proclamation, which was a significant step in the eventual abolition of slavery. The Proclamation declared that all slaves in Confederate territories were to be set free; however, it did not apply to slaves in Union-occupied territories or border states that had not seceded.
It was primarily a war measure, designed to weaken the Confederacy's ability to sustain the war effort. While it did not immediately free all slaves, the Emancipation Proclamation set the stage for the thirteenth amendment which would constitutionally ban slavery throughout the United States.
Lincoln's plan to prohibit slavery ultimately led to the Civil War. His Emancipation Proclamation, while an important step towards the abolition of slavery, only freed slaves in rebellious areas and did not completely eliminate slavery in the United States. The Civil War erupted as a result of the deep-rooted divide between the proslavery South and the antislavery North, with the Southern states seceding to defend their perceived right to own slaves without federal interference.