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World War Two.
The assassination of Archduke Ferdinand was a major event that led to WW1
It was Germany's invasion of Poland that began World War II.
guns
Vietnam war
World War 2 was a pretty major event.
The Holocaust
World War I
Yes, it was the spark that began World War One.
World War II.
A major event was the conflict between the North and South about how African Americans should be treated. The South thought they should be slaves while the North thought opposite. Fights began to go through and it got worse and worse until a war began.
World War 2