The American arsenal includes roughly 3,700 warheads, with about 1,700 of them currently deployed, according to the Federation of American Scientists. (Representational File Photo)

Written by William J Broad

US President Donald Trump ’s threat Wednesday to restart the testing of nuclear weapons has raised numerous knotty questions about national and global security.

The United States spends tens of billions of dollars every year on its large arsenal of the world’s deadliest weapons and the infrastructure that supports it. Here’s what you need to know about American atomic bombs and the issues involved in whether or not to test them explosively.

How many nuclear bombs does the United States have?

The American arsenal includes roughly 3,700 warheads, with about 1,700 of them current

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