If you’re talking about world war 1, Russia entered into World War I on August 1, 1914, when Germany declared war on it. In accordance with its war plan, Germany ignored Russia and moved first against France—declaring war on August 3 and sending its main armies through Belgium to attack Paris from the north.
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The answers are a), b), and c). Despite economic prosperity, the United States suffered from widespread poverty. Unions comprised almost half of the workforce, resulting in a large-scale expansion of the middle class in the 50's.
