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On December 17, 1903, Wilbur and Orville Wright made four brief flights at Kitty Hawk with their first powered aircraft. The Wright brothers had invented the first successful airplane.
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Albert Einstein proposed theory of relativity.
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When he finally became King Edward VII on the death of his mother in 1901.
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Russia, Britain and France had an alliance called the Triple Entente. When Austria-Hungary invaded Serbia following the assassination of the heir-apparent to the throne of Austria-Hungary (Archduke Franz Ferdinand of Austria) Russia joined in to help Serbia per a separate agreement.
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Britain joined WWII for a confluence of reasons, chief among these was the growing acceptance that Germany's expansionist policy would inevitable bring the UK into conflict with Germany, and that delaying would give further advantage to the growing German war machine.
