Approximately 70 million individuals lost their lives over the course of World War II .we are the cost of the war both human lives and financially was worth fighting the war?

Yes

Explanation:

Im not sure if this is the answer you are looking for but yes, the nazis instigated the war and the atrocities the nazis caused would have been far worse than it was, there would have been many more deaths at the hands of the reich including the complete extermination of every jew in europe.

my only credibility is my nerdyness, complete interest and research into WW2

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.