1945
Since the end of world war2.
reagan
The cold war was brought to an end because the soviet union broke up [in1991].
By the use of the atomic bomb. This brought man into the atomic age.
The U.S./America joined World War2 in 1941
The fall of the Soviet Union
We haven't had that one yet. We will need to have 9 more. We just had WWI and WWII
I presume you mean WW2 not 11, but i brought an end to the great depression
World's End - Cold Case - was created on 2007-11-04.
The atomic bomb
World War II brought the end of colonialism.