On May 7, 1915, a german submarine torpedoed and sank the Lusitania, a British cruiseliner which had 128 American citizens on board, as well as military goods. It was the first step to the US joining the war.
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In advocating for the League of Nations, Wilson wanted to create a unity between nations in order to avoid the same issues that led to World War I. Unfortunately the US rejected this proposal.
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That new regular army developed the techniques of battle and siege that were used to achieve most of the 14th-century Ottoman conquests, but, because it was commanded by members of the Turkish notable class, it became the major vehicle for their rise to predominance over the sultans, whose direct military supporters ...
The development of the steam engine....of that is an option. You really should include the choices.