Muriel Siebert became the first woman to own a seat on New York Stock Exchange.
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Iowa became the 29th state to join the United States of America.
President Richard Nixon signed the US Endangered Species Act into law.
Hong Kong began to slaughter the city's 1.6 million chickens to stop the spread of an influenza strain.
The first American test-tube baby, Elizabeth Jordan Carr, was born in Norfolk, Virginia.
Scarlett Johansson made her debut on Broadway.
