The Wilmot Proviso banning slavery in any new territory to be acquired from Mexico not including Texas which had been annexed the previous year it passed the House in August 1846 and February 1847 but not the Senate Later an effort failed to attach the proviso to the Treaty of Guadalupe Hidalgo. ! .
! Name Province/state # Washington D.C. Business Directory Main article: Battle of Cerro Gordo, Popular sovereignty developed by Lewis Cass and Stephen Douglas as the position of the Democratic Party was to let each territory decide for itself whether to allow slavery! .
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