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In 1833, England’s Parliament banned slavery in the British empire.

In 1922, radio station WEAF in New York City aired the first radio commercial, a 10-minute ad for a real estate company. The station charged $100.

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In 1955, Emmett Till, an African-American teenager from Chicago, was abducted from his uncle’s home in Money, Miss., by white men after he supposedly had whistled at a white woman.

In 1963, Martin Luther King Jr. delivered his famous “I Have a Dream” speech to 200,000 people at a peaceful civil rights rally in front of the Lincoln Memorial in Washington.

In 1968, Vice President Hubert Humphrey was nominated for president on the first ballot at the stormy Democratic National Convention in Chicago.

In 1971, Ziggy, the Brookfield Zoo elephant that once tried to kill its trainer, was allowed outdoors for the first time in 30 years.

In 1979, Judge Louis Garippo ruled that John Wayne Gacy would face charges in a single trial that he murdered 33 boys and young men in Chicago.

In 1990, a tornado cut a 16-mile-long swath through Will County, killing 29 people, injuring 354 and causing $160 million damage, mostly in Plainfield, Crest Hill and Joliet.

In 1996, President Bill Clinton was nominated for a second term at the Democratic National Convention in Chicago’s United Center.

In 2008, Illinois Sen. Barack Obama became the first African-American to receive his party’s nomination for president, when he was officially confirmed at the Democratic National Convention in Denver.

In 2012, Republican Mitt Romney became the first Mormon to be nominated for president by either major political party.