What are the major causes of genocide in the twentieth century?​

Here are a few websites that may help :)

https://www.tandfonline.com/doi/abs/10.1080/09636410008429405?journalCode=fsst20

https://www.e-ir.info/2012/07/12/what-are-the-main-causes-of-genocide/

Explanation:

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.