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Mark Pennell sits at the helm of his time machine.Mark's Almanac is a 90-second time travel that highlights the world's history from the very serious to the sometimes sublime.

Mark's Almanac for August 20, 2021

8MK_(Detroit_News_Radiophone_station)_August_1920.jpg
THE DETROIT NEWS
/
WIKIPEDIA.
A publicity photo showing preparations for a broadcast by radio station 8MK from August 1920.

It was on this date in 1866 that President Andrew Johnson proclaimed to the world, that the U.S. Civil War was officially over. And it was on this date in 1920 that the first radio station to be licensed by the federal government went on the air. The radio station was 8MK (what is now WWJ radio) in Detroit.