Question

What is the best explanation for why the Cold War is not included in this Chart

Answer 1

The Best Explanation  for why the Cold War is not Included in the chart Is because:
~That was not a Conventional War, and its Costs are Measured by the Individual Proxy Wars.

Hope this helps.

Answer 2

The best explanation as for why the cold war is not included in this chart is that it was not a conventional war, and its costs are measured by the individual proxy wars.