With one of the world's biggest armies, the US has also committed to reducing the role of nuclear weapons in its national security strategy.
China ranks third in terms of the most nuclear weapons worldwide, holding 350 warheads.
France is the fourth country with the most nuclear weapons worldwide, with 290 nuclear weapons.
Ranking fifth when it comes to the most nuclear weapons, the UK has 225 nuclear warheads.
The former British colony also holds a massive stockpile of nuclear weapons, with a total of 165 warheads.
Most people would be surprised to learn that India has many powerful nuclear weapons. Ranked at number seven, it actually has 160 nuclear weapons.
Israel has 90 nuclear warheads, making it the eighth country with the most nuclear weapons in the world.
The most politically isolated country in the world, North Korea began developing nuclear weapons in the '80s, in defiance of international agreements and sanctions.