The United States has not conducted a working test of a nuclear weapon since the early 1990s. That could change. President Donald Trump has repeatedly vowed to restart testing, raising alarms about a dangerous new arms race with Russia and China.

“Other countries are testing,” Trump said Sunday on " 60 Minutes ." The United States is the “only country that doesn’t test” its nuclear weapons , he said. That created some confusion among nuclear observers. The United States, China and Russia have all observed “decades-long moratorium on underground nuclear blasts,” said The Wall Street Journal , and continue to do so. (Russia has recently tested warhead delivery systems, which seems to have provoked Trump.) America also has an “extensive program to ensure the reliability of its nu

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