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the sinking of the USS Maine occurred in 1898 leading to tensions between the United States and Spain and contributing to the outbreak of the Spanish-American war.

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the Spanish-american war was a conflict between the United States and Spain , primarily sparked by tension in Cuba . it resulted in a swift american victory , influencing the role of the U.S. as an emerging global power.

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the annexation of Hawaii involved the incorporation of the Hawaii islands into the U.S , leading to the establishment of one of the United States territories .

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the assassination of Archduke Ferdinand was the trigger for World War I , killed by a Serbian nationalist .

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the sinking of the Lusitania was a maritime disaster during World War I where a German submarine sank the British passer ship , contributing to the U.S. Decison to enter the conflict .

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the Zimmerman note was a secret message from the German government to mexico allies, proposing an allies against the U.S.

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the Philippine-american war was an armed conflict between the United States and the Philippines following the Spain-American war .

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the treaty of Paris concluded the Spanish- American war whit Spain ceding Guam , Puerto Rico , and the Philippines to the U.S.

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the treaty of Versailles concluded World War I imposing hard conditions on Germany .

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the League of Nations established after World War I it was an international organization aimed at promoting peace and cooperation among nations .