During World War I, Japan officially declared war on Germany.
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The largest farm worker strike in US history began.
The first-ever message was sent from a ship to the shore at Cliff House, San Francisco.
The World Council of Churches (WCC) was founded with 147 churches from 44 countries.
During the French Revolution, a mass levy was adopted, making it compulsory for any able-bodied men aged 18 to 25 to join military service.
Chris Messina Tweeted #barcamp, which became the first use of a hashtag on Twitter.
