What were the effects of WWI, particularly effects for the U. S.? How was WWI fought? What made it different from earlier wars?

1. How WWI effect U.S?
World War I pulled the United States out of a recession and into a 44-month economy.
2. How was WWI fought?
Fought mostly by soldiers in trenches, WWI saw an estimated 10 million military deaths and another 20 million wounded.
3. What WWI made it different from earlier wars?
World War I was the first war in an industrialized age. New weapons and vehicles were used in this war that had never been used before.