How did the Great Dying create a huge demographic shift in the Americas?

The Great Dying caused massive social, economic, and cultural upheaval in numerous Amerindian societies. This was probably the major factor in the disintegration of the Aztec and Inca empires. The calamity also had a major impact on the development of the new Spanish empire in the Americas.

Explanation:

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Military life during W.W. II was about training and preparation.  There was very little time for anything else.  Then came the time to fight in a war and things get darker as they engage the enemy and soldiers either get killed or suffer from their wounds.