Explain this quote from the movie: "Mother says there's likely to be a war. Something about some old duke that's been shot at somewhere." What event is this referring to? movie WareHouse

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is this a multiple choice question? if so, could i see the answers to give you the right one!

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.