President Richard Nixon signed the US Endangered Species Act into law.
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Scarlett Johansson made her debut on Broadway.
Vladimir Putin signed a law banning the US adoption of Russian children.
Iowa became the 29th state to join the United States of America.
The first American test-tube baby, Elizabeth Jordan Carr, was born in Norfolk, Virginia.
LinkedIn was founded by Reid Hoffman and the founding team members from PayPal and Socialnet.com.
