 Apart from bias/ill will, incompetence or changing access to sources, the differences result chiefly from categorisation and methodology issues.The totals advanced usually include or exclude various categories.Scholars who focus on killings or "violent deaths" most typically list (1) combat and combat-related deaths; figures in this rubric range from 100,000 to 700,000; (2) rearguard terror, both judicial and extrajudicial, recorded until the end of the Civil War