What event helped cause the eventual split of the Democratic Party, paving the way for the Republican Party and Abraham Lincoln? Kansas choosing to become a free state Nebraska choosing to become a free state the U.S. Supreme Court decision on Dred Scott the Missouri Compromise of 1820

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The event that helped cause the eventual split of the Democratic Party, paving the way for the Republican Party and Abraham Lincoln was: Kansas choosing to become a free state
This occurrence split the votes for democratic party (those who're pro slavery and those who don't) and helped Lincoln securing his position as a president of united states