This Is When The World's Nations Got Their Nuclear Weapons

While only used in conflict twice, the devastating effect of nuclear weapons is clear enough to have changed the course of history and redefined how states think about war. Allowing countries the opportunity to wipe out massive populations at the press of a button is a terrifying reality that has led to international efforts to stop the proliferation of warheads and secure the ones that currently exist.

The WorldPost presents a timeline of when the world's powers got their own nuclear weapons:

UPDATE: The introduction of this post has been updated following the nuclear agreement reached between world powers and Iran.