Before the Civil War, America Was a ‘House Divided’ in More Ways Than One - The New York Timeshttps://www.nytimes.com/2021/05/18/books/review/american-republics-alan-taylor.html
1787 Constitutional Convention1846 Mexican-American War1861 American Civil War
Mexican–American War - Wikipediahttps://en.wikipedia.org/wiki/Mexican%E2%80%93American_War
1846 Mexican-American War

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1846 Mexican-American War
History of the United StatesMexico and the United StatesPast wars