1969 was a historic year. Neil Armstrong and Buzz Aldrin walked on the Moon. The first Boeing 747 took to the skies. And The Beatles released their iconic album Abbey Road.

There was, however, something else going on in that year -- an economic trend that strangely mirrors a similar trend that is occurring today. It concerns the U.S. unemployment rate, and it could spell trouble for the stock market. Here's what you need to know.

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Source Fool.com