The Lecompton constitution caused a complete break between President Buchanan and his former political ally,

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The Lecompton Constitution, which was a pro-slavery constitution proposed for Kansas, caused a rift between President Buchanan, who supported it, and Stephen Douglas, who opposed it because it went against his principle of popular sovereignty. Douglas believed in letting the territories decide the issue of slavery for themselves, rather than having it imposed by Congress or a pro-slavery constitution.

The Lecompton Constitution Caused a Complete Break Between President Buchanan