Germany worried about the alliance between France and Russia, for if they declared war on either one of them, they would have to fight a war in 2 fronts, and usually, when fighting a war in 2 fronts, your troops and supplies are strained, and you cannot use your full force on either side
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According to the Constitution, laws passed by Congress must be approved by "the President," although it is possible for a law to pass without such approval, if there are enough votes in Congress.
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As a result, Harlem, a neighborhood at the northern end of Manhattan, became a center for Afro-centric art, music, poetry, and politics; Revived by the wartime migration and fired up by the white violence of the postwar riots, urban blacks developed a strong cultural expression in the 1920s that came to be known
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