The strain of swine flu known as H1N1 had its first case in the US.
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The world's first weightlifting championship took place in London, England.
A nuclear disaster occurred at Three Mile Island in Pennsylvania, US.
Roman Emperor Valentinian I made his brother, Flavius Valens, his co-emperor.
Bank of Tokyo and Mitsubishi Bank merged to become the world's largest bank.
The Treaty of Florence was signed, which ended the war between the French Republic and the Kingdom of Naples.
