The basic assumptions of the Lost Cause have proved durable for many in the modern South. The Lost Cause tenets frequently emerge during controversies surrounding public display of the Confederate flag and various state flags. The historian John Coski noted that the Sons of Confederate Veterans (SCV), the "most visible, active, and effective defender of the flag" "carried forward into the twenty-first century, virtually unchanged, the Lost Cause historical interpretations and ideological vision formulated at the turn of the twentieth". Coski wrote concerning "the flag wars of the late twentieth century":