Though the counties of Virginia that were soon to form West Virginia were specifically exempted from the Proclamation (Jefferson County being the only exception), a condition of the state's admittance to the Union was that its constitution provide for the gradual abolition of slavery (an immediate emancipation of all slaves was also adopted there in early 1865). Slaves in the border states of Maryland and Missouri were also emancipated by separate state action before the Civil War ended. In Maryland, a new state constitution abolishing slavery in the state went into effect on November 1, 1864. The Union-occupied counties of eastern Virginia and parishes of Louisiana, which had been exempted from the Proclamation, both adopted state constitutions that abolished slavery in April 1864. In early 1865, Tennessee adopted an amendment to its constitution prohibiting slavery.