9 countries with the most nuclear weapons

What are nuclear warheads? These are weapons of mass destruction that can wipe out an entire city in minutes and kill everyone in it.

After the havoc they wreck, their radioactive effect is still felt because they damage the environment for generations to come.

Nuclear weapons have been used once in history and that was by the United States in 1945 when they bombed Hiroshima and Nagasaki during the second world war.

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