Why the 20th century called the bloodiest century in human history?

I need help with this problem .. The 20th century has been called the bloodiest century in human history. It has also been called "the American century" by historians. Examine why he was called to explain the progression of the First World War, the Second World War, the Cold War and the Korean and Vietnam wars. Be sure to include the technology, doctrines, ideological, political, geographical results and the progress of the U.S. foreign policy during this period …. Any help would be great! =]

Technology: You should review the progress (?) Made in war technology. At the beginning of the century, the armies fought on horseback. In the mid 1900s, tanks, planes and atomic bombs had been added to the arsenal. At the end of the century, the battles are events dedicated to the precision that have been orchestrated by generals far from the action using computers and high tech devices. And do not forget that the most powerful nations of the world still thousands of nuclear weapons was the other. Ideology: How was nationalism, communism and fascism lead to bloody conflicts in 1900? It is beginning. My brain hurts too much to add more.

CNN Millennium 10 5 North America, etc Media, Technology & Space Exploration in the 20th Century 1900s

Frances Densmore, US anthropologist Photo Mugs Frances Densmore (left, 1867-1957), US ethnologist, using a phonograph (left) to record the voice and stories of Mountain Chief, a Native American from the Piegan tribe. Densmores speciality was ethnomusicology, recording the sounds and use of music in Native American culture in the early years of the 20th century. The Piegan tribe are part of the Blackfoot Confederacy of tribes, and live in Monta…

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