Which of the following conflicts is considered the world's largest and most deadly according to historical records?

The Second World War is recognized as the world's largest and most deadly conflict in history based on historical records. This war, which lasted from 1939 to 1945, involved numerous countries and resulted in significant loss of life, with estimates of total casualties ranging from 70 to 85 million people. The scale of the conflict was unprecedented, with entire nations mobilizing their economies and populations for war. The widespread battles fought on multiple fronts, combined with atrocities such as the Holocaust and the use of atomic bombs, contributed to an immense loss of life and widespread destruction across Europe, Asia, and beyond. This extensive impact on both military personnel and civilians underscores why the Second World War is often considered the most devastating conflict in human history.