aug 1, 1914 - Germany Declares War on Russia

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After the assassination of Archduke Ferdinand of Austria-Hungary, Germany declared war on Russia in support of Austria. This is Russia's entrance to WWI.
(image: https://vancouversun.com/news/local-news/this-week-in-history-1914-germany-declares-war-on-russia-igniting-the-first-world-war)

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