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The date is generally posted as 25 April 1846 until 2 February 1848. The Thornton affair matches that starting date, but Congress did not approve a declaration of war until 13 May 1846. The Treaty of Gudalupe Hidalgo was signed on 2 February 1848 but there were hostile incidents after that date which could be considered acts of war.
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the edmunds tucker act is about ending poligamy.
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I am not sure the exact day but, I now it was in 1916