When the number of people who took an oath of allegiance equaled 10% of the number of voters who participated in the
election of 1860, the state would be readmitted to the Union after
organizing a new state government which abolished slavery.
Lincoln was assassinated before this plan could be put into effect.

10 percent plan: A model for reinstatement of Southern states, offered by Abraham Lincoln in December 1863, that decreed that a state could be reintegrated into the Union when 10 percent of the 1860 vote count from that state had taken an oath of allegiance to the United States and pledged to abide by emancipation. The next step in the process would be for the states to formally elect a state government. Also, a state legislature could write a new constitution, but it also had to abolish slavery forever. At that time, Lincoln would recognize the reconstructed government.