Italy used its current tri-colored flag for the first time.
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Beyoncé and Jay-Z welcomed their daughter, Blue Ivy Carter, into the world.
French forces attacked Calais and took it back from English rule.
The US celebrated the opening of the country's first railroad station in Baltimore.
The distress signal 'CQD' was established.
The iconic Leaning Tower of Pisa leaned 'too far,' which resulted in its closure.
