When the Emancipation Proclamation was announced, Tennessee was largely held by Union forces and thus not among the states enumerated in the proclamation, so it freed no slaves in the state. Andrew Johnson declared all slaves in Tennessee free on October 24, 1864. On February 22, 1865, the legislature approved an amendment to the state constitution prohibiting slavery, which was approved by voters the following month, making Tennessee the only Southern state to abolish slavery. Tennessee ratified the Thirteenth Amendment, which outlawed slavery in every state, on April 7, 1865, and the Fourteenth Amendment, which granted citizenship and equal protection under the law to former slaves, on July 18, 1866. Johnson became vice president when Lincoln was reelected, and president after Lincoln's assassination in May 1865. Tennessee became the first Confederate state to have its elected members readmitted to Congress on July 24, 1866.