On this date in history:

In 1922, a New York City realty company paid $100 for the first radio commercial, on station WEAF.

In 1955, while visiting family members in Money, Miss., 14-year-old Emmett Till, an African-American from Chicago, was slain for supposedly flirting with a white woman four days earlier. (His alleged killers were acquitted.)

In 1963, Martin Luther King Jr. delivered his I have a dream speech from the steps of the Lincoln Memorial before more than 200,000 people gathered for a Freedom March in Washington.

In 1968, the Democratic Party nominated Hubert Humphrey for president as thousands of anti-Vietnam War demonstrators battled police in the streets and parks of Chicago.

In 1986, Soviet spy Jerry Whitworth was sentenced in San Francisco to 365 years in prison and fined $410,000.

In 1990, a tornado struck Will County in Illinois, southwest of Chicago, killing at least 27 people and injuring more than 350.

In 1996, after four years of separation, Prince Charles, heir to the British throne, and his wife, Princess Diana, were formally divorced.

In 2005, Hurricane Katrina picked up strength as it roared toward the U.S. Gulf Coast, reaching Category 5 status, with winds of almost 150 miles an hour, touching off one of the largest evacuations in U.S. history.

In 2008, U.S. Sen. John McCain, R-Ariz., the presumed Republican nominee for president, chose Alaska Gov. Sarah Palin as his vice presidential running mate.

In 2009, the June 27 death of entertainer Michael Jackson was ruled a homicide by drug overdose after his personal physician admitted giving him the powerful anesthetic propofol and the sedative lorazepam on the day of his death.

In 2011, Tony Tan was elected the seventh president of Singapore after more than 83 percent of eligible voters cast their ballots.

In 2012, delegates at the Republican National Convention in Tampa, Fla., chose Mitt Romney as the party's presidential nominee.

In 2013, U.S. Army Maj. Nidal Malik Hasan, who admitted to killing 13 people and wounding many others at Fort Hood in Texas in 2009, was sentenced to death.

In 2014, a World Health Organization report said an Ebola epidemic had killed more than 1,552 people in four West African countries: Guinea, Liberia, Nigeria and Sierra Leone.

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