21 years.
take it easy
world war 2
yes all it would take is for one person to get mad and its started
World War 2.
1939-1945
4 years
About a year.
World War 2
World War II
1st world war - 1914 to 19182nd world war - 1939 to1945
World War I: 1914-1918. World War II: 1939-1945.
The war lasted 6 years