President Truman announced to the people of America that they successfully developed a hydrogen bomb.
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A 57-year-old man received the first transplanted heart from a genetically modified pig.
The US celebrated the opening of the country's first railroad station in Baltimore.
Beyoncé and Jay-Z welcomed their daughter, Blue Ivy Carter, into the world.
The first US commercial bank, The Bank of North America, opened in Philadelphia.
Black men were chased away by gunmen after trying to rescue white survivors during a mine explosion.
