The Atomic Bomb :D right answer by the editor.
The Aztecs did not exist before God but they most likely did exist before Christ was born but the rest of the world did not know they existed until we started sending ships to the new world.
No, they did not exist until July 1945. WW1 was over before 1920.
Yes, Vietnam is an ancient country. Vietnam is one of the world's oldest ancient country ever existed thousands of years ago. Mesopotamia started to exist in 3200 BC, Egypt started to exist in 3100 BC, Vietnam started to exist in 2879 BC, Korea started to exist in 2333 BC and China started to exist in 2070 BC. Thousands of years ago, Vietnam was called Dai Viet. Dài Việt was the first name of Vietnam before they called it Vietnam.
The 'stormtroopers' ceased to exist before the Holocaust started.
So long as nuclear weapons and the motive and means to use them exist, yes
yes
it did not exist.
The weapons exist.
Gold weapons do not exist unless they are ordered custom made
During world war 2, the project existed to create the nuclear weapons dropped over Hiroshima and Nagasaki.
No, there are no mermaids at all . They only exist in the Legend but not in the real world . They did not exist before neither they don't exist now nor later or after. yes they are...
we'd be wearing animal skins, hunting bears an making weapons outa rocks :D