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what made wwi the first “modern” war?

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On April 6, 1917, the United States entered World War I. Get a firsthand look at how a new breed of weapons like WMDs, submarines, armored tanks and air attacks changed modern warfare forever in WWI: The First Modern War.

To sum it up, this was the first war were the U.S had tanks, submarines, and air attack in our arsenal.

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WWII was called the modern war thanks to the new inventions of planes and other more modern technology

d is the correct answer

~courtney

food and resources were plentiful.

women were encouraged to marry later in life so they could work in factories.