Today is Monday, Aug. 20, the 233rd day of 2012. There are 133 days left in the year.

Today's Highlights in History:

On Aug. 20, 1862, the New York Tribune published an open letter by editor Horace Greeley to President Abraham Lincoln titled "The Prayer of Twenty Millions"; in it, Greeley called on Lincoln to take more aggressive measures to free the slaves and end the South's rebellion.

On this date:

In 1833, Benjamin Harrison, 23rd president of the United States, was born in North Bend, Ohio.

In 1866, President Andrew Johnson formally declared the Civil War over, months after fighting had stopped.

In 1882, Tchaikovsky's "1812 Overture" had its premiere in Moscow.

In 1910, a series of forest fires swept through parts of Idaho, Montana and Washington, killing at least 85 people and burning some 3 million acres.

In 1920, pioneering American radio station 8MK in Detroit (later WWJ) began daily broadcasting.

In 1940, during World War II, British Prime Minister Winston Churchill paid tribute to the Royal Air Force before the House of Commons, saying, "Never in the field of human conflict was so much owed by so many to so few."

In 1955, hundreds of people were killed in anti-French rioting in Morocco and Algeria.

In 1968, the Soviet Union and other Warsaw Pact nations began invading Czechoslovakia to crush the "Prague Spring" liberalization drive.

In 1972, the Wattstax concert took place at the Los Angeles Memorial Coliseum.

In 1977, the U.S. launched Voyager 2, an unmanned spacecraft carrying a 12-inch copper phonograph record containing greetings in dozens of languages, samples of music and sounds of nature.

In 1986, postal employee Patrick Henry Sherrill went on a deadly rampage at a post office in Edmond, Okla., shooting 14 fellow workers to death before killing himself.

In 1992, shortly after midnight, the Republican National Convention in Houston renominated President George H.W. Bush and Vice President Dan Quayle.

Ten years ago: Without firing a shot, masked German police commandos freed two senior diplomats from armed men who had stormed the Iraqi embassy in Berlin, bringing a bloodless end to a 5-hour hostage drama by a previously unknown group opposed to Saddam Hussein.

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