Works Cited

Spielvogel, Jackson J. World History. New York: McGraw-Hill, 2005.

Hanson, David C. "The Sinking of the Lusitania."Virginia Western. 2008. 17 Apr. 2011. <http://www.virginiawestern.edu/faculty/vwhansd/his122/Lusitania.html>.

"Trench Warfare WWI." <http://dc3127.k12.sd.us/event/Trench%20Warfare.htm>.