Two. World War I and World War II.
However, the first (1914-1918) was a mostly European conflict
These wars are known as World Wars because many countries of the world fought in the war
There were thousands of wars all over the world in antiquity. Ancient wars were fought near many rivers in many parts of the world.
Many wars. Including World War II.
There were 2 world wars.
World?*
There's only been two world wars in the history of man.
Both of them.
Many
The United States has fought in World War One and World War Two, the only two world wars so far.
Two. World War I and World War II.
Both of them.
2