World War 2 of course, it was the first to use nuclear weapons and the only War which France was conquered by the Germans completely.
world war 1
world war 2
the biggest war of all is world war 2 but most people say it was the civil war p
I am not being facetious: The biggest effect of World War I was World War II.
World War one was the first great war. It was the biggest war the world had seen and involved many countries.
world 2 war
World War I was the biggest war in memory for the people during that time period. I believe they called it the war to end all wars. They hadn't had World War II yet, and so they though that World War I was going to be the biggest war in history for all time.
Poland.
Germany
It was the biggest war throughout history of the entire world.
"The World war 1 trench was the biggest I have found" or "The trench in the ocean was the biggest in the world"
Well I don't know if this answers your question,or at least part of it,but the Battle of Kursk was the biggest battle in World War 2.Followed by the Battle of Prussia.The 5th biggest was the Battle of Berlin.Hope this answers your question.=)