The first telephone call was made across the Atlantic – from London to New York.
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Black men were chased away by gunmen after trying to rescue white survivors during a mine explosion.
Beyoncé and Jay-Z welcomed their daughter, Blue Ivy Carter, into the world.
President Truman announced to the people of America that they successfully developed a hydrogen bomb.
The US celebrated the opening of the country's first railroad station in Baltimore.
The first-ever photograph of genes was taken.
