The Westminster Bridge across The Thames opened in London, England.
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Theresa May announced her resignation as British Prime Minister.
Paavo Nurmi ran a world record time of 3000 meters in 8 minutes and 25 seconds.
The United States and Russia signed the Moscow Treaty, agreeing to limit their nuclear arsenals.
The first telegraph message was sent.
Amy Johnson became the first woman to fly solo from the UK to Australia.
