What were the politics and strategies that caused the start of the 1st World War

This website looks like it will answer all your questions:
http://www.firstworldwar.com/origins/index.htm

For the sake of being thorough, here are some other articles which you
may find interesting:
http://www.pvhs.chico.k12.ca.us/~bsilva/projects/great_war/causes.htm
http://www.lib.msu.edu/sowards/balkan/lect15.htm
http://www.worldwar1.com/tlss1914.htm
http://www.schoolhistory.co.uk/lessons/wwi/objectives_wwi.html
http://www.geocities.com/SouthBeach/Palms/2460/causes.html
http://www.infoplease.com/ce6/history/A0862003.html

I found these articles by searching Google for:
"World War I" causes
://www.google.com/search?q=%22world+war+i%22+causes

I also reviewed these two directories:
http://directory.google.com/Top/Society/History/By_Time_Period/Twentieth_Century/Wars_and_Conflicts/World_War_I/General_Accounts/
http://directory.google.com/Top/Society/History/By_Time_Period/Twentieth_Century/Wars_and_Conflicts/World_War_I/General_Accounts/

Thanks for the question and if you require more information regarding
my answer, don't hesitate to ask for clarification.  And if you find
this answer satisfactory, please feel free to rate it. Thank you!
           
xemion-ga

Thank you for your solutions - there were most helpful