Image result for What made WWI the first “modern” war?
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.
Mark as brainliest.
