I think number 2 is correct im not sure .. but lmk if im wrong
Answer:
A prolonged war and greatly increased the number of casualties in the war
Explanation:
In World War I we saw the introduction of chemical weapons, machine guns, artillery, and tanks. All of this resulted in trench warfare and the lack of tactics to fight the new weapons meant that the war would be longer and a lot deadlier than it would have been without those weapons. It dragged for years from one stalemate to another and claimed a lot of lives.
Answer: C.
Please mark brainlest!
Explanation: Here is the short answer and I got it right on Edge 2020(for those Edge users!)
D. 1800s because that's when Cuba, Puerto Rico and Mexico gained independence
