Today in History: December 18
In 1865, the 13th Amendment to the Constitution, abolishing slavery, was proclaimed in effect.
In 1892, Peter Ilyich Tchaikovsky’s ballet “The Nutcracker” publicly premiered in St. Petersburg, Russia; although now considered a classic, it received a generally negative reception from critics.

In 1957, the Shippingport Atomic Power Station in Pennsylvania, the first nuclear facility to generate electricity in the United States, went on line. (It was taken out of service in 1982.)
In 2011, the last convoy of heavily armored U.S. troops left Iraq, crossing into Kuwait in darkness in the final moments of a nearly nine-year war.