The resumption of unrestricted submarine warfare by Germany, from 31 January 1917.
<span>German u-boats were sinking US merchant ships and killing US seamen even though USA was a neutral. Further, ships of other neutral nations sailing to and from the US were also being sunk.All this was adversely effecting the US economy.
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the great depression and WWII
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Congress could only request that states pay taxes. They couldn't actually levy taxes.
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<span>Foremost, the Mongols produced a charismatic leader, Genghiz Khan, who united the Mongol tribes in a dream of conquest and expansion.</span>
